This isn't about whether or not they get arrested. This is about certain ground rules and principles that the government must always uphold, even against unprincipled opponents.
Federal law enforcement officers, dressed in camo gear and without any identifying insignia, arresting and covering the faces of alleged rioters and stuffing them into unmarked vehicles and taking them God-knows-where is absolutely unacceptable.
These principles are what separates the government from the rioters. How are you going to hold the government accountable when you don't even know which government agency a certain police officer belongs to?
The uniforms in the videos clearly say "POLICE" on them. According to the people released, they were read their Miranda rights - and who cares that they are dressed in camo and using unmarked cars?
As long as the suspect is put before a judge, I don't see the issue.
A tiny amount of "police" text isn't worth much of anything. There is absolutely no defensible reason to hide the agency patch and badge number of every individual officer on the ground. There is absolutely no defensible reason to tie beanbags around the faces of arrestees. There is absolutely no defensible reason for the police to put arrestees into unmarked vehicles.
There is no way of ascertaining exactly who these federal agents are. This precludes court redress and is unacceptable.
I mean, they do seem to be sworn law enforcement, I just wonder if they are operating under any sort of valid remit that would make it reasonable to call them police.