Earlier quoted context omitted.
ICE doesn’t do law enforcement against citizens. It does affect citizens tangentially but not directly. ICE will not come after citizens for crimes. That would be regular local police, state police or FBI/ATF, etc. ICE is immigration enforcement. Some people may not like that especially illegal residents but it would be a poor way to affect citizens like fascists or communists did.
You haven't been paying attention.
Just like if you want to protest eminent domain but officers come in to move out protesters getting in the way of construction. People will get arrested. You can protest peacefully. You cannot interfere with official acts or be violent.