Why do white supremacists think they're better?

Gosh its so hard to answer this without getting tagged for BNBR. Let’s see. They are firstly ignorant of ancient history or they would know there are no pure white people. They are ignorant of biology or they would know we are all melanin colored. They have some basic personality disorder.

Now take my dad. The one who beat me so badly that as my spine aged I became permanently disabled. The one who raped me. But by god, he was better then any Nword!!!

The louder they talk about it the more I wonder what they are trying to cover up.