Baseless conspiracy is baseless.
More than likely, this young man lapped up Trump's violent rhetoric, then expirenced first-hand the damage his policies were doing. When you've been conditioned to think of political violence as the ultimate solution, and then suddenly realize that your "God-King" is a demented pedophile conman who fucked your whole town out of their money, rights and homes in order to enrich his pedophile billionaire buddies... Well, the rest is history. He took his shot.
I think the guy was a young impressionable idiot, but at least he had some balls, which is more than you can say for most people.