This guy and his crew beat up and threatened to kill someone for a petty crime. What does that have to do with the police existing "too much"?
That's exactly what caused all of these protests.
> At what point are adults responsible for their own actions?
It's constantly of interest to me how much "free will" actually exists. The more research comes out about environmental factors, the more we realize that people who suffer {home, food, employment, physical} insecurity exhibit symptoms as if they had a lower IQ and stress which is correlated with increased mental illness, stress, blood pressure, and other health problems.
It also strikes me that the current legal corrections system really only works if we, as individuals, have significant ability to decide not to commit a crime as opposed to it being the most likely destiny based on our current {personal, environmental} state.