It does not matter whather you punish him or how much all that much. The root cause is how police systematically reacts, how afraid they are and how little they value citizens lives.

I don't see people saying he should not be punished. They say that cops needs to change.

Focusing on his punishment is like adding yet another hack into badly engineered system - it makes people feel good and makes one bug go away, but it does nothing to address root cause which is bad system.