Sure, everything ultimately exist for some reason, but that doesn't mean everyone agrees with the reasoning :)
I don't know what the answer is (also an outsider), but I think there is a third possibility of people just disagreeing with the move of "Lets forcible check every single potentially illegal immigrant, so we can get rid of the illegal ones" from a purely humanitarian perspective, regardless if ICE might be abusing their power or if they're only removing illegal immigrants.
Edit: I'm wondering if positing two options like that is actually engagement bait of sorts, already we have two confident commentators saying "It's N of course" where N is both 1 and 2, and I myself fell into the trap of thinking of the third missing one :)