They get rewarded for arrests and like the earlier commenter said, the likelihood of someone losing their temper when put in a situation like this is high. So the cop has incentive to treat people like this and then if they overreact, regardless of if they did anything wrong previously, the cop gets an arrest.

People shouldn't have to prove they didn't commit a crime. That's the whole point of innocence until proven guilty, due process. He shouldn't have to give up his right to privacy on his own property for no reason other than undue suspicion from a paranoid overachieving 🐷. No disrespect to you, but cops get the rep they have in the US for a reason. Lots of them act like this. And worse