Being nice does not make a cop good. Cop's always attack people it's their job.
Maybe not you at that time but the next person they will rob, control and harass.

I know a cop who told me that he and his college where somewhere to steal a car from someone. He said the other cop was rude, and that he did not like it, he said that he was nice.
Well it does not matter at all. They stole the car.
And being "nice" saying; I do not make the laws I just enforce them. Does not absolve him from personal responsibility. It's the same sentence as; Just doing my job just following orders.

Cops are also funded with stolen money, which if you don't hand it over they come with guns to your house and take it. It's a protection racket.

Feeling ashamed or guilty is the last thing you have to do in the presence of a cop that harasses you.

I'm not saying you do that though.
peace

If there were good cops, would there be bad cops?