Yes, and yet the misdemeanour charges were thrown out. Didn't it occur to you to ask why? Don't worry, I got you. It was because of a technicality. Apparently, the length of the barrel of the semi-automatic weapon you have is all-important.
This is what I'm talking about. "White supremacy" is just not a good enough end point for these questions. To understand what the problems are, and more importantly, how to fix them, you need to dig much deeper than these simplistic answers.
As for "if white supremacy, then what?" Can you really not see any other answers to why this happened? You don't think the rioters burning Kenosha to the ground were part of the problem? You don't think the fact that the police effectively stood down as Kenosha burned are part of the problem? You don't think insanely permissive gun laws are part of the problem? You don't think Rittenhouse's irresponsible parents were part of the problem? Obviously Rittenhouse's own stupidity was also a major part of the problem.
Even if you feel an irresistible urge to blame white supremacy for the shooting of three white men by another white boy, surely it must be at the very bottom of a long list of other more proximal causes.