I don’t know why people are making a big deal out of this. The purpose is to round-up and deport scofflaws who have already been legally ordered to leave the country. Enforcing court orders is actually a legitimate function of the executive branch. Maybe people are just shocked that Trump is actually doing his job.
I do marvel at the stupidity of telling people in advance precisely when you are coming for them. Now I wouldn’t know about this kind of thing, but guys who are good at fighting always say to me that the real key is never to say “OK, let’s fight” or “I’m going to kick your ass,” but simply to proceed to the ass-kicking without the announcement. And above all, never say “I’m going to kick your ass by jumping you when you get off the bus Sunday,” because they will either (1) take an Uber that day, or (2) arrange to have their five toughest, most heavily-armed friends with them on the bus.
Based on that general set of principles, this advance announcement means either that the ICE people will find nobody, or they will be in danger from people defending their friends and family.