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Police do it because mostly for a very simple reason. It is their job! We the people have asked them to do it, and granted them the required authority to do so. We society should also be responsible for setting limits on the authority granted.
As a person who has had two jobs where I was in a position to ask people to change their behaviour, I can tell you that for me it was just a job. My job was partly to try and keep people from hurting themselves by doing unsafe actions, and then assisting them if they did it anyways. That is all I ever tried to do. No power trip, no "I am superior" attitude etc. Just a job.
There are people with ego issues in every position. Many other positions besides police come with certain authority to control others. People with ego problems in any of these positions can cause problems.
I think it's an individual thing, not a general thing.
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