They aren't agents unless they have a badge and a warrant. Failing to produce those means you are being assaulted by unknown assailants. Your freedom and life are already in danger at that point and you have a legal right to self defense.

Sure, but if I’m going to be kidnapped and sent to a black box prison to die, I don’t know if I would care much about that.

Bystanders who are obviously white and documentably citizens are in the best position to try to unarrest people, if they can. It’s not illegal to prevent a kidnapping if you can, and a group of people who don’t show a warrant or identify themselves taking someone off the street against their will is a kidnapping.

I’m aware that it requires bravery and has very serious potential consequences, but I cannot emphasize enough that just because a person is not currently the target of this type of violence, does not mean that they can stay uninvolved. I understand not wanting to do it, but it’s like not wanting to go to the doctor about a sketchy mole because you’re afraid of hospitals.

Nope. Fighting will get me killed. I ALWAYS have a knife on me. I'll take at least two of the shit stains with me though. I know lots of places to strike where you will bleed out in less than a minute.