I learned over the years to understand the cops (not like them but understand them). It is often really bad how they treat people but it is simply years and years of dealing with problematic people that made them that way. It is still wrong but if you had a few encounters where you put yourself in danger by being too nice you simply change your mode of operation.
Of course there are also power mad bad guys who enjoy slamming you into a wall sometimes or play other games with you.
I am going to see if I can work something out with the police chief next week so they know when they roll up on me that what I do looks suspicious, but I am breaking no laws. Part of my job is to break in to houses to re-key the locks and install a lock box to allow access for the bank.
Did you sometimes encounter people who did not want to leave?
Alea iacta est ("The die has been cast")