I'd just make a supplementary comment, which is that there is a government bill before the House, Bill S-7, which is being moved by Minister Nicholson. It would make it an offence under the terrorist offences act to leave Canada in order to join a prescribed terrorist entity. These young fellows leaving Canada to join al-Shabaab, al-Qaeda, and Hezbollah would run afoul of that bill should it pass into law.
On March 21st, 2013. See this statement in context.