So how about this: If I believe that Western European males (i.e., "white people") are responsible, directly or indirectly, for just about everything that is good and valuable in Western Civilization*, and that EXPLAINS why whites dominate in so many different areas. Oppression of others who are NOT of Western European stock is the normal and natural consequence of superiority, and oppression should be identified and eliminated to the extent possible.
Does that make me a White Supremacist?
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* Science, literature, the arts, law, governance, architecture, and the skilled trades. And even in Sport, where Blacks often dominate, the games and the infrastructure were created by white men, without whom sport would be conducted like the old vaudeville trade.