You are a conspiracy theorist. I am a skeptic.
You are aware that entire position - that "lone nut" assassinations are a product of secret organisations - is per definition a conspiracy theory, right?
Now, basically, we're left with the following reasons for lone nut assassinations being hard to find before 1750:
* Public leaders not really being public, instead opting to hide behind armies and big walls.
* Without television or publically spread photographs, most of the population of any given country would hardly even know what their ruler looked like.
* Record-keeping being rarer and less reliable.
* Small guns not starting to be reliable before the 20th century (revolvers were rarely used in the wild west, as they were as dangerous to the wielder - or even more - than to the target).
* Hunter/sniper rifles becoming far, far more accurate over long distances for a decent marksman, making it possible to kill over longer distances
* People being far more geographically limited than they are today.
* And also, a far lower population, what with it staying fairly stable for a few millennia, and then exploding with the coming of modern medicine. In itself not that significant, but combined with geographic freedom, access to good assassination weapons, and access to the public leaders, the amount of persons who by themselves and for no particularly good reason are willing to and capable of shooting an important public figure can and will increase a lot.
Not a single one of these arguments contains any conspiracy theory whatsoever. They are in fact arguments used by people who are skeptical about conspiracy theories. Arguments based on verifiable facts about the world. The same way that no airplanes were made before the 20th century because the technology simply didn't exist before then.
In contrast, here is Galileo's socalled reason why "lone nut" assassinations were rare before 1750 (not nonexistant, though, as has been shown several times in this thread):
* All of the well-known "lone nut" cases were in fact born out of a conspiracy (possibly by some secret shadow organisation), so that political (or other) goals were achieved without it appearing so.
Now, this is of course the very -definition- of a CT argument. It simply -cannot be- anything else than a conspiracy theory.
And what's even funnier is that, in essence, this argument tries to prove conspiracy theories not by proving an actual conspiracy theory, but just claiming that conspiracy theories exist because [Phenomena X] is part of a conspiracy theory. Which of course, when looked upon with a skeptical eye, turns out to be a circular arguments, because the claim doesn't actually show any direct evidence that [phenomena X] is part of a conspiracy theory.