Because the people with the same attitude as that guy are—mindboghlingly—in power.

There are plenty of people who reject that rhetoric. That's what BLM is, as a currently-relevant, specific example.

The problem is the aforementioned undermining and exploitation of selfish and self-serving attitudes and actions has led to an unreasonably large base on the other side, giving the illusion (at least to you) that nobody is rejecting it.