I'm not sure a mosque hosting homophobic and anti-semitic speakers counts as a radical environment ideal for fostering suicide bombers. That literally describes every single Christian church I've been a member of since I was 7 years old, except one.
I do think the environment facilitates extreme opinions, or at the very least places fewer obstacles in the way to developing extreme opinions, but I think there's a lot more that contributes to a person getting to the point where they'll take such extreme actions.
The society around them must play a role. Even a cult born out of Christianity knows the first thing to do to get a person deeper is to isolate them from society.
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Uncertainty is an uncomfortable position.
But certainty is an absurd one.
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