These kids get indoctrinated by the right-wing media monster. They actually start to believe the horseshit guys like Andrew Tate, Ben Shapiro, and Charlie Kirk spew. Of course, those guys don't believe in anything they're saying. They're just in it to make a buck. So eventually those guys have to sorta kinda play by the rules. They'll backtrack, tone it down, or whatever to keep their sponsors, their political connections, what have you. Except they've already radicalized these hyper-online kids who have now gone further down the rabbit hole of fascist shit to even worse people like Nick Fuentes. Now they're in Groyper, Boogaloo/Proud Boy, actual white supremacist/accelerationist fantasy land. The grifters are gone and now it's just legit insane/evil people who actually want to kill everyone. And those people think the Charlie Kirks and Trumps of the world aren't bad enough and therefore should be eliminated.
The MAGA chuds have weaponized their own twisted followers against themselves. Shooters like this guy and Crooks who took a shot at Trump are the Marlo Stanfield to Trump and Co.'s Avon and Swinger Bell.