The video was shot from a distance so it's hard to say whether he had back up. The refusal to return fire would make sense with the amount of people milling around. Hitting innocent bystanders is another no no.
No one seems to intervene to get him away from his assailants, so I wonder whether he was alone, which again begs the question as to why?
Exactly. There's been so much irony on display in this last political cycle it's hard to know where to start. Off the top of my head have you seen how many Blue Lives Matter flags were on display?