The problem with the current push on "illegal immigrants" is that
1. It has been incredibly brutal
2. Many of the currently "illegal" immigrants were not illegal until their status was revoked by the current president.
3. The question of your immigration status, under the current system, is decided without proper access to legal representation.
These problems are very much worth drawing a line in the sand over.---
Some people feel that the current push is solving a real problem in the real world.
Unfortunately, the real world is actually very complicated, and you can't flatten that complication without violence.
If that is hard to imagine, replace the ICE acronym with Alcohol Tobacco and Firearms, Bureau of Land Management, or Internal Revenue Service.
I am not fine with mass surveillance.