It has probably been said before somewhere but I don't see why the people who want to fight for IS are not allowed, even encouraged to go. I would even help pay their fare provided they had their passports stamped no return to Australia, UK, Canada, Europe, NZ or the US etc... and the authorities in the transit countries as well as MI6, Mossad and the CIA etc... were notified of their travel itinerary and hopefully did the right thing to help them on their way.
