I am sorry to say this but white supremecy does not have the potential to kill millions. It's like saying gang violence has the potential to kill millions.
Except that within the memory of people still alive to witness it, it killed approximately 6 million people in concentration camps...?
Nazism, which formed the ideological foundation of modern white supremacy, killed millions just a few generations ago. To argue that white supremacy doesn't have the potential to kill millions simply ignores not-to-distant history. We cannot ignore what has already happened many times before.