The issue isn't with the deportations -- it's actually with the change in tactic, and a lot of the extrajudicial behavior. Immigration is an absolute mess, and it's one we created ourselves with one bad policy after another. I'd recommend "Everyone Who Is Gone Is Here" to understand the 50+ year history of how American military and political involvement in Latin America created the instability which caused the refugee crisis -- and even created the cultural phenomena that resulted in the creation of MS13.
Change in tactics? This is as violent as it gets, the migrants being turned into slaves (paid $1 per day) while awaiting deportation, living in the worst possible conditions, possibly worse than jails.