Meh, I tire of people with overly negative attitudes towards cops in general.
Yes, with great power comes great responsibility yadda yadda...
Problem is that cops are just human and they behave as humans collectively do.
So expecting them to be some force of saintly uncorruptable gaurdian angels who never abuse their power or make a bad judgement is actually a pretty unrealistic expectation - unless you replace them all with robots.
So yeah, filiming them against their consent, is going to p1ss them off, as it would p1ss anyone off. There are times when having a bit of consideration and common sense is more practical than excersing ones own Rights.
All things considered, the cops we have in the western hemisphere are really not that bad at all. Try filming cops in China and let see what happens :P I'd rather have some bad apples than no apples. If they all quit, have a geuss who and what would take their place
So overall I'm quite grateful to their existance, because:
A) I could never do their job
B) Without them, me and my family would quite possibly all be dead by now.