Aside from the FLQ crisis, Canada has no modern history of suffering terrorist attacks or even the threat thereof. I think the idea that "the terrorists" (again, nameless and numberless) see no difference between Canada and the U.S. is a blanket statement. It depends on who we are dealing with, their motives, etc. For example, the terrorists busted in Canada had no relation to Al Qaeda.
Terrorism has always existed... but the recent attacks are in relation to U.S. historical foreign policy in the ME. Canada has no tie to that, and thus there have been no official attacks in relation to that. In effect, the U.S. is dealing with its own foreign policy disaster. Global terrorism in the vague sense will continue to remain what it has always been and will be dealt with on a case by case basis. I realize the media now has a tendency to connect all acts of violence with terrorism, but that's their usual sensationalist agenda for ratings and in reality terrorism takes place for a huge variety of reasons.