I got $50.00 that says he was just a dumbass who wore body armor to thr protest.
Now the guy with the rifle slung....he has some questions that need answering
Why would someone wear body armor unless he thought something would be happening....
I know of several reasons....one that fits these circumstances is that the knucklehead was worried the police would shoot him for being at the protest.
I am not agreeing that police would do that....but that would be most likely reason he would be wearing it if he were not one of the suspects.