I have personally seen the overwhelming good that good officers accomplish every day. Just as there are great police officers who truly love their jobs and do the best they can in very difficult conditions, there are the few who seem to be caught being complete miscreants and violating common rules of decency and good order.
Holding any group's feet to the fire is not being anti this or anti that. Being charged with carrying a deadly weapon and being the "line" between civility and barbarity comes with great responsibilities. When cops are right, they are rightly praised. When cops are wrong, they must be held accountable.
Personally, I think it ought to be standard policy that if you flee from a police officer, you will be shot. That way there is not uncertainty of the outcome. There is no justifiable reason for someone to flee police. This officer was polite and not threatening in any way while he was questioning Mr. Scott.