Get out of your liberal urban centers and you'll find that in most of America the police are very popular and it has nothing to do with income or race. Low income? That means crime effects you even more, which is more reason to support the police. Live in a very white part of the country? The overwhelming amount of crime will come from other white people, and accordingly most of the arrests will be of white people. And yet the people of those communities still support the police with borderline religious devotion.

Half the people I work with aren't white, and roughly half aren't straight either. By internet stereotypes they'd be judged to be progressive liberals who want police reform but in actuality my car is one of the few in the parking lot that isn't a pickup truck with "back the blue" decals on it.

Another point of fact: When democrats trash the police they start losing elections. Even most people who usually vote democrat get demoralized and stay home when the election turns to anti-police rhetoric. The only people who really hate the police are career criminals, people adjacent to career criminal lifestyle and culture (their families, etc) and of course rich liberals who can easily afford to insure all their property, live in controlled access communities and never have to interact with the criminal elements of society except on their own terms.