Except that those do exist. For example, Patriot Prayer, Proud Boys, outlaw biker gangs trafficking drugs, violent white supremacist groups, anti-govt militia groups, and some ultra-radical Christian sects.
As I mentioned in the OP, when white groups protest the govt, it's freedom and patriotism. When minority groups protest the govt, there's a call for more law and order (or 'send them back'). The targeted law and order bit is what then leads to the dynamic you observed between police and minorities. If there was a 'law and order' crackdown on white people every time they protested the govt, you would see the same.
I'm not saying they don't exist. But how many of these are causing enough problems for the police to panic on a daily or hourly basis? Do the proud boys terrorize neighborhoods with organized crime? Does some ultra-radical Christian sects perform drive-bys on other churches? Are rival biker gangs killing each other over turf in the city? I'm not seeing it to the same degree.
