Because you're attributing and promoting the idea of a nefarious motivation to what clearly demonstrates good intentions or at least benign ones. It's one thing to say that there were some adverse consequences, it's another to say those consequences were deliberately the primary and intended goal.
ok lets start with the first one in the article I used as a source:
people chose to leave, but more of them were driven out due to
policy—agricultural policy, in particular. Republicans and
Democrats, alike, have supported laws that favor corporate
agriculture, which continue to drive small farmers out of
business and depopulate the countryside
This is a fact, not a conspiracy. But was that the intended goal and was that goal as you say nefarious?
I would claim YES that was the intended goal, and nefarious means
ne·far·i·ous
/nəˈferēəs/
adjective
(typically of an action or activity) wicked or criminal.
"the nefarious activities of the organized-crime syndicates"
synonyms: wicked, evil, sinful, iniquitous, villainous, criminal, heinous, atrocious, appalling, abhorrent, vile, foul, base, abominable, odious, depraved, corrupt, shameful, scandalous, monstrous, fiendish, diabolical, devilish, unholy, ungodly, infernal, satanic, dark, unspeakable, despicable, outrageous, shocking, disgraceful; archaic knavish, dastardly; rare egregious, flagitious
Yes that too!
FDRs New Deal
Myth: The New Deal Was for Small Farmers
"Historians and economists have reached an overwhelming consensus that the New Deal farm bills were designed to aid large farmers and succeeded in doing so"
Think about that. This is no conspiracy theory. This is what the farm bill was
designed to do.
It gets worse:
"The Agricultural Adjustment Administration (AAA)
“accelerated the increasing concentration of land,” writes Pete
Daniel. “Obviously, large landowners reaped most of the federal
money.”9
An aide to Henry Wallace, then the secretary of
agriculture, later said the AAA was “militantly for the larger
farmers.”
So you tell me, does this meet the level of "nefarious" yet? I don't know what your career is, but lets just say for whatever reason the government decided to close down your place of business, and drive you out of your house too, force you to relocate and get a new career, and hand your job to someone else for whatever reason. Would that be nefarious?
Oh it gets even worse, believe me.
"With the backing of the U.S. Department of Agriculture (USDA), large farmers cut costs and drove small farmers out of business, while local USDA agents discriminated against black farmers on a systematic basis: by
1920, there were 925,000 black farmers, and by 1970, 90
percent of them were gone.20 Some of these farmers left for
better opportunities, but more were forced out in one of the
“largest government-impelled population movements in all our
history.”2"
Oh it gets worse, believe me:
"Black farmers who held onto
their land used their independence to support civil rights
workers, which often made them targets for lynch mobs and local elites.2"
Are we to nefarious yet?

Maybe Libtard sounds almost kind now? In my opinion we already left nefarious and entered into pure evil already and we haven't even gotten to one of the most despicable elitists/racists the USDA ever put in control of public policy. The evil Earl Butz. See I can call him an evil racist because he actually was forced to resign he was so racist and he served in prison he was so evil. Even if it was the Libtard racist New Deal farm bills that caused 90% of black farmers to be militantly forced off their land. (yes cooperation with lynchings and forced labor is fairly described as militant) But lets get back to Butz's policy changes.
oops another myth
Butz’s farm bill was “the logical extension of the acts of
1965 and 1970,” according to former USDA chief economist
and Kennedy adviser Willard Cochrane.4
Damn, another Libtard causing something being blamed on a Republican. I should have known.
Does this let Butz and the neoliberals off the hook? Weeeeeeell not exactly
There was a difference, however: a wealthier class of farmers
was affected. A group of sociologists who interviewed a
representative sample of Iowa farm operators during the crisis
found that “persons most at risk of forced displacement from
farming are found to be younger, better educated, and largescale operators.”5

OMG a policy designed by libtards to drive small scale black farmers off their land now modified and used by neoliberals and their new partners in crime, the newly created big conglomerate food industry, to force well educated hard working white folks off their land too! Just to make room for even BIGGER monstrosities and the destruction of entire rural communities both of their minorities and their well educated whites. How evil a bureaucracy can you get!?
Oh but this is just the natural progress as y'all stated earlier. Weeeellll that's not exactly true either.
Experts agree that neither economies of scale nor
technology give large-scale farms an edge over smaller ones.63
In 2013, USDA researchers surveyed the literature and
concluded that “most economists are skeptical that scale
economies usefully explain increased farm sizes.”64 Similarly,
technology itself does not inherently—or as the USDA
researchers put it, “explicitly”—benefit owners of large-scale
farms.65
Now go back up and look at the stats I gave. You know the ones where the average age of farmers was 58.3 with over 20 times more farmers over age 75 as under 25 and only 46.1% of farmers even make a net positive income from farming?
finally:
combined with policies that provide
commercial farms with easy access to capital, while withholding
it from smaller ones, as happened in the United States
aha, destabilized financially even when they were more efficient and higher quality than the big boys

That's almost the last straw, but it gets even worse, believe it or not. I know it seems impossible to get worse, but this is deeply rooted evil we are dealing with. Farmers are notoriously stubborn and many are much smarter than anyone wants to give credit. I mean like elite smart. Like smarter than your typical doctor or lawyer.

Even smarter than a 5th grader.
Some few still survived against all odds. They have developed new models of agriculture completely separate and isolated from the industrialized system and 100s of times more efficient by any rational metric. You could basically call it survival of the fittest, where the survival rate was far less than 10%. The survivors are tough. The business models they designed robust. The crop and animal husbandry systems they designed resilient against all sorts of catastrophes like floods and droughts and whims of the markets. And it just so happens they are so good they can actually save the world from AGW.
And so many of these best and brightest farmers literally have been attacked by making their operations unreasonably illegal. You can read up on that here:
Everything I Want To Do Is Illegal: War Stories from the Local Food Front
You get it yet? We can fix it. Not only can country boy survive, he can save you too. All that is needed is the above "access to capital" and stop trying to drive us off the land and just let us do our important work of rebuilding the degraded foundations of this great country.
But we don't even want capital from the backstabbing banks. We want paid for providing a needed service that benefits all society. Just like trash collectors get paid to do their job, we want paid to remove the CO2 "trash" from the atmosphere. Not offsets, not charity, Not tax deductions, not socialist dividends split evenly. We don't even want you to drive the corporate boys out of business, because they are our neighbors too. We want paid to do a job y'all need done. Whoever does the job with a verified carbon market and sequestration protocol for sequestered soil carbon, gets paid a price per ton carbon sequestered. That's not charity, socialism, nepotism, communism or any other sort of degenerate corruption. You want something done, pay us to do it, and we will.
You pay for it and be sure it will get done. And if it doesn't then you have nothing to pay, so your risk is zero! We take 100% of the risk and expect to be paid well for that as any entrepreneur would.
Dictionary result for entrepreneur
en·tre·pre·neur
/ˌäntrəprəˈnər,ˌäntrəprəˈno͝o(ə)r/
noun
a person who organizes and operates a business or businesses, taking on greater than normal financial risks in order to do so.
Its a win win for everyone. There is no down side. That's how the conservative can roll up our sleeves and pull your sorry arses out of the fire.

The American way.
Oh and just in case you didn't read it the first time here it is, please read it this time:
The Butz Stops Here: Why the Food Movement
Needs to Rethink Agricultural History
And the original essay for conservatives:
Is there a technically viable and economically advantageous solution to Climate Change and what is preventing its implementation?
and my white paper on the plan for policy makers:
Can we reverse global warming?