That's because the Americans who were saying that are all either in favour of ICE or working for them. But there are just as many Americans who did not shout about the right to own guns because they could see all the problems with them, and many of these Americans are quietly organizing resistance. I'm not in the USA and I won't judge American people for not picking up a gun and mounting a solitary suicidal attack on better-armed Nazi thugs. Proper resistance takes numbers and organization, and Americans have been trained to be inexperienced at collective action.

That said, some of the scenes in Minneapolis show that collective action can work against thugs like ICE. They are cowards in the end, and you need enough people to resist in small ways for it to be effective.