Well, I hate to say it, but to a certain extent this is true. Nothing like a British or European university to finish radicalizing a Muslim from the boondocks.
Not that there is any lack of terrorism back home. I seem to remember a civil war where the Muslim Hausa tribe murdered the Christian Ibos in Nigeria by the thousands.
But they do often get a finishing polish on their radicalism in European universities.
Yes, I think the “missing ingredient” is the overwhelming hatred and loathing of Western culture and capitalism. This is only available in latent, meager, and a blunt form at home, but becomes a full-blown, pointed, activist, brainwashing experience in the Western schools.