The problem with the US police is that they are just badly trained. To become a police-officer in Germany, you have to undergo a 3 year long fulltime training, with heavy emphasis on deescalation and prevention, and just a small focus on "shoot! shoot! shoot!" . In the US, there are states that require not more than 360 hours of training that has little to no deescalation-training, but alot about preparing to shoot in any situation at a target, with training to kill.
So, while policemen are in general good people, if one did "his job wrong", than he was just doing what he was trained for, and that is to be a (comparably) bad policemen when you compare it to the standards of the rest of the industrialized world.
Edit: To put that even more into perspective.Germany has mostly a 40-hour week as basis of calculation. I don't know if this is the same for police-training, but it is most likly the case. In Germany, if your reduce national holidays and mandatory holidays a employer has to provide, a year has 1,680 workhours. So, to become a policemen, you can calculate 5,040 hours of training for a policemen. This is roughly 14 times more training than a US-policemen gets.
I had to go incognito for this one. ​
​ Apparently it's rated E for everyone 10+
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All the best