Why the re-dawning of tribalism and racism on the right and the left?

When conservatives talk about how cultural Marxism has destroyed us, they usually don't mention that it has also advanced those who promoted cultural Marxism, who were often minorities who used cultural Marxism as their will to power.

It was relatively easy to push the more conservative or at least traditional liberal academics aside because academics often come from a pool of nerds who did well academically but not so well on the rough and tumble playgrounds where many of the cultural Marxist's came from.

Many conservatives don't want to see that the reason this dynamic cultural change has turned into tribalism and racism is not because tribalism and racism are evil but because tribalism and racism are a deep part of real human nature, which we inherited from our hunter/gatherer ancestors.

Human nature is flexible enough to be able to deny its own nature for a time before is pulled back as if on a genetic leash to its inherent ethnocentrism. We see the charge of evil racism hurled by people who are pushing their own racism. Ain't humans something?

This explains the re-dawning of tribalism and racism on the right and the left, and it is suicidal and weak-minded for either side to deny it.