[dudul]

" the only reason to be polite to them is "because otherwise they may kill you". "

Spot on. Everyone saying "she should have been nicer" are effectively saying that you should submit to the police or they'll kill you. Nobody is saying "he deserved politeness and she was rude" because it's very obvious that he was not polite to her. "How are you doing? You seem upset?" Well she just got pulled over and is getting a ticket bozo, what do you think?