Doesn't mean they were not ostracized in their private schools for being different my friend.
It's the feeling of being an outsider that promotes this type of negative thinking and mass school shootings.
All people want is to feel listened to, accepted and respected in most cases.
Screw that!
They fucked up their own lives with drugs & drifting, and instead of ever growing out of it & taking some ownership, they keep looking for others to blame and came down with this big hate-on for society.
There's no such thing in the universe as the right or expectation of wholesale approval. For a person to be accepted & respected they have to do their part of bargain and deal with the fact that some, or even most people may not like them or their choices, that's life.
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These guys aren't really the profile for the type of Muslim converts we expect to be worried about. They're a couple of immature, unstable & oversensitive types who are easy to manipulate.
I'll bet they've experimented with various "angry" movements prior to Muslim fundamentalism, but probably lost patience with them.
When they stumble upon radical Islam, the certainty in it's absolutism, the way it seems to be taking bold & epic actions these days, I think they felt this was the vehicle which would allow them to make an impact soon.
Their "handlers" probably recognized right away that these were rash, undisciplined men, so their only real value was as disposable shock instruments.