Theory:
It's all part of a 'Progressive' plot. The Gamil Garbi (a.k.a. Marc Lepine) incident was suposed to happen on Nov 11 so as to lesson our connection with Remembrance and Veterans while the NEW Kanada commemorates the 'more relevant' female dead students. But, Lepine was a true crackpot and his 'progressive' handlers lost him at the end: he went early, and we lost Halifax Explosion Day instead of Nov 11.
This guy(s) handlers lost him AWOL - he did not execute his mission on 11 September as planned so as to lesson the meaning of 911.
Students are the target because they are the same age group as most of our dead soldiers, represent the countries future, and will leave their cohort with decades to influence their future decisions. Just think of the laws and regulations we will face when Lepine's survivors and today's cohort are Judges, MPs, Mayors and Premiers in two or three decades.
Montreal is the site because it is full of people who hold an inordinate amount of political leverage and who believe that all evil can be legislated out of existance if we merely outlaw everything.
Will Afghanistan be their defining moment? No, running down Atwater will be.
Sucks to be us.