Indeed, in a working ideal model(see below for more on this*) of society the police exist to enforce the rule/spirit of law equally to all people.

ICE should ostensibly be a federal branch that is held to account by the government as a whole and deals specifically with customs and immigration related issues.

Citizens with no customs or immigration issues aren't really part of that mandate so it should be handed off to the relevant authorities that do in fact deal with that type of 'crime'.

Things are so far removed from that, that ICE is effectively running on gang/gestapo rules at this point and the government is actively encouraging it.

* So, by working ideal model i'm describing a point of view using traditional ideals of fairness and law, that assume the system is working towards that ideal.

The current system is not at all set up that way, so even if it seems batshit , this might actually be the system working as intended by the current sitting majority power (or if you're really cynical like me, capitalism as a whole).

So not only are you fighting to move the overton window in a direction that resembles the storybook ideals of fairness and equality, you are also fighting the existing imposed status quo.