And extremists will often go where the ground is fertile. In fact, I recall something about the US sponsoring a campaign to this effect in '79: Go to Afghani

And extremists will often go where the ground is fertile. In fact, I recall something about the US sponsoring a campaign to this effect in '79: Go to Afghanistan! Join the Jihad! Fight the evil imperialists for the glory of Islam! In retrospect, that might have been short-sighted.