Why does he refuse to condemn them?

[Millhouse]

One thing I don't understand is somehow equating condeming Antifa with white supremacists. Sure I wish Biden would come out and condemn them, they are pieces of ***t. But in the grand scheme of humanity, white supremecists are the worst of the worst. They are responsible for slavery going back to at least the 1400s. The complete domination of other peoples not just here for the hundred years after the Civil War, but in places around the world like South Africa. The annihaliton of countless millions in the 1930s and 40s by the Nazis.

The comparable damage done by both is not even in the same realm of discussion.