Unless you mean to tell me that the spread of these ideas "isn't doing much", which frankly, I'd consider even worse.

It absolutely isn't doing much, because those ideas aren't spreading in a vacuum. They're spreading in competition with the sensible view of equality, which is winning simply because it's the only thing that really makes sense. Good ideas consistently win against bad ideas absent a strong force standing behind the bad idea; and it's really hard to find a stronger force than government.

In the U.S., racism is on the decline not due to government mandate. Racism is on the decline because in the 1960s the government stopped endorsing a particular race as superior. We don't need the government mandating anti- racism and how the population treat each other; we just need the government to treat everyone equally and the problem of racism will continue to decrease.