[vkou]

They aren't bad people because they can't find a relationship.

But a lot of them act in bad ways because they believe/have been told to believe that their difficulty in finding a relationship is someone else's fault.

This often makes them utterly insufferable to be around, which is a positive feedback loop.

And then, hey, look, here's a disaffected community of angry young men, all feeling that society has taken a great big dump on them, all ripe for radicalization by some cynical ideologue.