Then, armed and masked thugs weren't going around cities assaulting and murdering American citizens with a promise that they have Federal immunity for whatever they can get away with.
You know, ICE isn't actually running amok just randomly assaulting and murdering tons of people, right? IIRC (and I may not) there have been two citizens killed, both in Minneapolis.
But let's unpack that just a teensy bit, and get our heads around what the situation is, and how we got here.
Under various names, we've had immigration enforcement with the authority to deport anyone not legally in the US for over a century, since the late 1800s. That's a real, pre-existing federal branch of law enforcement, enacting actual real federal law.
A bit over a decade ago, as illegal immigration began to rise materially... some cities in the US took it upon themselves to decide that they would no longer recognize the authority of those immigration officers, and would no longer comply with federal law. They named themselves sanctuary cities, and defied federal law. Interestingly, the degree of defiance seems to wax and wane with the party in the oval office. When Democrats are in office, those cities just refused to serve up and inform ICE (or its prior versions) when they had apprehended an illegal alien. But if ICE showed up with a deportation order, they didn't get in the way. Pretty much they just said "it's not our job, you do it".
But under republican administrations, and especially under Trump, those cities have begun to actively and intentionally interfere with federal law enforcement. The block deportations, they refuse to provide information when asked, and they explicitly tout themselves as being a sanctuary for illegal immigrants where those illegals will be protected from federal law.
Minneapolis started protesting before ICE had actually done anything. They've been protesting ICE since days after Trump took office, as soon as Trump set out a plan to actively enforce immigration law. And those "protests" have continuously become more and more unhinged over the past year. The governor and various politicians have been actively encouraging and supporting intentional interference with ICE. They have been egging on citizens following, harassing, and threatening federal law enforcement agents. Activist groups have arranged widespread plans to interfere with ICE, to aid and abet those that ICE is seeking to apprehend, to identify ICE agents with the intention of harassing and threatening their families. They follow ICE agents and yell, scream, blow loud whistles, taunt, insult, and otherwise be complete and utter ◊◊◊◊◊◊◊◊ to federal agents. They block agents in with vehicles, they set up barricades, they vandalize EVERYONE's cars and buildings.
This has been going on in Minneapolis for an entire year. And out of that there have been two incidents where ICE agents lost their minds and killed someone. I'm not excusing that - those agents should face criminal charges for it.
But realistically, at this point we've had a solid six years of deep blue cities making it their life's mission to antagonize and harass law enforcement, to actively interfere in both local and federal enforcement activities. That is a crime. It is a crime to obstruct justice or to interfere with public duties, it's a crime to threaten and harass law enforcement officers for doing their jobs.
So it's not like ICE just woke up one morning and said "Oh hey, you know what would be fun? Let's go kill some random people!" It's been years of concerted harassments and illegal activity that has been politely tolerated over and over and over.
But now we're at a point where politicians and activist leaders in Minneapolis (among other cities) have been literally and unquestionably inciting their populace to engage in criminal activity and to defy federal law. It sucks. It should never have come to this. But those cities and their politicians bear a significant part of the responsibility for intentionally creating this situation.
Minneapolis has decided it wants to cosplay as a sovereign citizen and declare that it doesn't recognize federal authority to enact federal law. It's irresponsible of the leaders of those cities to use their citizens as pawns in their own political shenanigans.