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I seldom opine about global affairs since I have no specialized knowledge in the field. On the other hand, as a citizen in a democratic society, I feel eligible to comment and put my thoughts out into the free marketplace of ideas.
A recurrent concern among government officials is the risk that citizens will go to war zones or train with terrorist groups, then return to our borders and plot acts of terrorism. Many countries have an estimate of how many people have left to engage in war. According to the linked article in the Néw York Times, governments are trying to discourage their citizens from joining Al Queda or the Islamic State.
For what it is worth, which may not be much, I think we are taking the wrong approach. We should not stop those who want to leave. We should give them fair warning that if they join a terrorist group abroad, they will lose their passport and not be allowed to return.
Call it the hasta la vista policy.