Just as the Constitutional protections can not protect us against people who only want to kill Americans, neither does it permit the police to protect the people against uncivilized people. Some uncivilized people including many winos and crazies only respond to pain. In the old days the police could take them in an alley and get their attention. Now days everyone seems to have a picture phone and anything the police do can end up as an out of context 10 second clip on the 6 pm news. This is why the modern police officer - once the situation is understood - spends most of their time writing reports explaining why they didn't make an arrest. Of course, there are always rookies and officers who never grow who will into violent situations and get their pictures in the news. I always let the rookies beat me to the exciting calls. They usually volunteered.