As I said in another comment, that's why I put illegal in quotation marks. I honestly couldn't come up with the right term, so I just went for the sarcastic air quotes instead.
As for the flag burning, you and I are on the exact same wavelength there. I commented on that in my other comment, too!
In this context, young men with mental health issues are the exact kinds of people to fall down the alt-right propaganda pipeline that the social media grifters are spewing, most commonly.
In my opinion though, his political affiliation is more important in the sense that it gives the copycat shooters and cultists less justification for the uptick we'll see in the coming weeks of attempted assassinations, death threats, and mass shootings (especially against democrats and minorities), though that's never stopped them before.