I prefer find, interrogate and apply a 9mm, 5,56, 7.62 or Hemp solution at the end. No imprisonment, these guys will never reform. Culturally they are so different from the White Bread Suburban view of the US and EU Elites, and normal citizens.
Obama's World View and Lead from behind mentality has created a problem which has engulfed the Islamic World in Flames. Obama's tilt towards Iran and away from previously tolerant Sunni Majorities has alienated old Allies.
In short, find, interrogate and kill is the only solution given what has transpired.