> Even if they were actually and genuinely only "really after illegals", these people would come up with another reason to be against it. If you commit crimes, such as murders, only against actual illegals (many of whom, to my understanding, are not even criminals, as theirs is a civil violation), you still shouldn't be wearing a uniform. So it would still make sense to oppose ICE for those who think their actions were illegal.

That's not what the first part of the statement means tho. "Really after illegals" isn't talking about murdering illegals. It's talking about removing people who crossed a border illegally.

Legal border control is completely reasonable. So is legal deportation. Warrantless search, seizure, detainment, and deportation are a different matter. They are not only questionably legal, but most importantly they create a militarized police force not accountable to laws that can used to oppress anyone who displeases power. Left unchecked this reliably goes very badly for everyone involved.