Every point you’ve tried to make can be made without asking people to pretend that the “regular” police haven’t committed the same atrocities time and time again.

The regular police has rules and pretends to abide by them. Agreed they don't pretend very much but they do pretend. And every once in a while, a bad cop gets convicted.

None of those things apply to ICE: they officially have zero rules, they openly practice racial profiling, they brutalize people with zero consequences (and I mean ZERO, not very low chances of consequences), they're masked like the cowards they are, and they very officially have complete impunity.

That's the difference with the police. We are still free to hate both the police and ICE intensely, but ICE is a different beast to hate.