Other than not having been convinced at all that most of those supposed agents are actual law officers or part of ICE proper, the other thing that I've begun to wonder is whether these supposed agents are actually getting bounty per head. The vigor with which they chase down whoever they think are immigrants seems to be a tad above what you'd expect from people driven by ideology, or even pure hatred. They're doing all that as if they have something personal to gain from bringing in more people.
The thought occurred to me when I saw the story if ICE agents descending on this woman whose lawyer simply went to the restroom in the courthouse. Really weird, the way they're so doggone persistent.