I haven't seen very many movies in the poliziottesco genre, but "Un poliziotto scomodo" ("Convoy Busters" in English) manages to be entertaining enough. As in a number of movies, the main character - a cop - tries to do everything the right way, but ends up on everyone's bad side, meaning that he has to go to extreme measures. It obviously looks more questionable in the era of awareness of cops randomly shooting people. If you just take the movie at face value without interpreting it as any sort of advice, then it's a pretty enjoyable romp. We get some fine shots of the Italian countryside. No masterpiece but pretty fun.