I don’t know about that. My Mom was watching CBS last night (I know - ugh!) and they spent a LOT of time on it and as the lead story, too.
Mental illness strikes first, then comes an external cover which in this case might have been white nationalist beliefs. The key point is, all of this evidence shows clear signs of mental illness. Almost at random he could have chosen to manifest as a communist, Islamist, or maybe a radical environmentalist. The belief structures may be different but the propensity to violence is similar, so any of them would attract different nutjobs to their ranks.
In a nation of 350 million people with 70 million declaring support for one candidate for president, the odds of a few of those being out of their mind are not low, but very high. So it’s a nothingburger, really. For anyone with professional training in any social science to pretend that this could be applied as a generalization demonstrates either nefarious intent or gross incompetence.
We should note in passing that there would be a few similar nutjobs with affiliations with various political enemies, and that doesn’t prove anything about them either.