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You could not be more wrong. Sgt. Crowley (the nameless 'cop' to you) is a Peace Officer. By legal standards everywhere Gates was a disorderly person who was disturbing the peace. He was given at least two 'lawful orders' to desist. He did not, he escalated. Sgt. Crowley had two choices, do his job or not. He did that for which he is paid by the good people of Cambridge.
That is the real world fact of it.
Actually since you are too lazy to read the thread rather than one post, the cop, the government empoyee, Crowley wasted public resources by making a bad arrest.
We know it is a bad arrest and we know Gates was not breaking the law because charges were dropped immediately when business hours the next day rolled around. When charges can not be sustained, you are not doing your job by arresting someone. So Crowley was wasting the money of the good people of Cambridge mostly likely because his ego got the best of him.
Of course you could have read the entire thread. You could try to think and learn from the discussion. But instead you just name call. Good job.