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This seems like more of an issue with your justice system. Cops are the same as anyone else. They are just as corrupt and make as many mistakes as any other person. This is probably going to be very different in other countries depending on the rules of the country.

No... Cops are individuals whom should have gone through enough training to realize that they have to restrain themselves enough to not shoot people if unwarranted. Thankfully, a very small minority of cops do this. But those who have this god-complex are incredibly dangerous people.