The more Islamophobia, the more disaffection from society, the more radicalization, the happier the extremists are.
The question of why the feds didn't intervene with the kids once they suspected pere Khadr was AlQuaeda is more interesting. I'm not really aware of the timing on that. However, I would suspect that the feds might have him under surveillance, and they wouldn't want to blow their cover by intervening with the kids.
Sad to say.