Then again, the right's desire to not implicate Trump for his radicalizing of men such as the one in the OP is just as ridiculous, baseless, and significantly more dangerous.

It's not that young man's fault that he was attracted to Trump's rhetoric any more than it was the fault of all those incels falling for Stefan Molyneux's shtick or all those semi-westernized Muslims that feel caught between the demands of their faith and the reality of the world that get radicaliszed by Isis. They're vulnerable with compromised critical faculties and then someone comes along and strokes their egos by pretending to listen to them by giving voice to their worst impulses. But that doesn't alter the fact that individuals like Molyneux and Isis and Trump do prey on these individuals and do radicalize them.