Of course, a few white americans commit racially motivated massacres from time to time. They are the ones being subjected to a process of national destruction and genocide.
If the japanese government went bananas like the US government and started importing non japanese people from all over the world by the millions you can bet your ass we would see angry Japs doing the same thing in Tokyo, Osaka, Nagoya...
Those americans are fighting national destruction and genocide... Fighting them in a completely wrong, immoral, cruel, unacceptable and COUNTERPRODUCTIVE way:
Killing innocent people going about their business.
But they are still fighting genocide, something even more monstrous.
And it's ironic as hell that genocide enablers call them "white supremacists" since genocide is the most perfect embodiment of racial supremacism.