I would say most American citizens are fearful(or at least shy of) of the police, avoid interacting with them if possible and generally have a disdain for how they operate. Not to say they are not recognized as necessary, most just don't like their tactics and their "code" of protecting one another. Basically you never know if you are going to get a good cop or a bad one, so you just avoid them all. Likewise anyone supporting them is seem as possibly supporting their questionable use of force and other bad practices.