“Doubling down on counter-terrorism at home and abroad won’t make Canada a safer place.”
Stephen Walt makes a good point about the degree to which Canada is under threat; that is, not very much. Whether Canada should be involved in the IS crisis, and whether Canada’s military contribution is significant are questions open for debate, though I think there is a little more to them than Walt’s treatment suggests.
http://www.foreignpolicy.com/articles/2014/10/24/stephen_harper_canada_terrorism_security
IR Theory & Practice 