Pity is what you feel when bad things happen to good people. Anger is what you feel when bad people get away with bad things. I don’t know about you, but anger is a much better motivator for action. Just remember:  “The only thing necessary for the triumph of evil is for good men to do nothing.”-Edmund Burke

Side note: anger makes you do dumb things you may regret. So use the anger to decide to take action, but use logic to execute that action. Both protests and mobs are full of angry people, only one also has logic.