Yes, I grew out of my "fuck the police" phase by the time I got out of high school like most normal functioning adults.
I did too. Then I learned how many were trigger happy, unqualified of the power and/or corrupt. It would be different if we heard about these things happening like once twice a year. Bit it's just too damn often. And these are just the ones that get caught. With them getting off so easy it doesn't really motivate the others to try to do better either.
"Heard about" is the active phrase. There are only about 900-1,000 police killings per year, in the U.S., total. This year is on track to be the lowest in 5 years so far.