Bumpas is a bad guy who was being intentionally antagonistic to the cops. I don't see anyone arguing otherwise. However, I don't see how that's terribly relevant to the question of how we should react when a cop abuses his power. Are you really arguing that justice is best served by basing it on who we would rather have as friends?

I'm not really seeing much disparaging of the police generally here. I'm seeing people disparaging police who act badly, which seems not only fair to me, but necessary.