Well it goes like this..
most of this youth was born in the west after their parents migrated to europe in attempt to escape poverty and political instability in their own homelands. While they did emigrate to the west, they still adhered to their values and cultures, which is not a bad point tho. But once they experienced the technological, economical and social advancement of the west, they did a first hand comparision of what they got in their own hometowns.
Obviously the wide gulf of differences kept hem frustated for a long time, and they couldnt do better than transferring their frustation to their children. And inflicted them with stupid idealogy of how being religious extremist and killing all infidels will bring the entire world kindgom to your feet.
If someone remembered the views of youth involved in the london bombing, they were similar case..