The war in Iraq was a very special case, because there were a lot of strategic interests of Canada at stake. In that case, if I go back to 2003, I was one of those who were saying that when serious business happens, we don't have a choice, we will go. It was a surprise for all of us academics, and we're still trying to understand what happened then.
Retrospectively, I can say that when some crucial interests were at stake at the time, the problem for Canada being that its main allies were divided, with the French and Germans on one side and the Americans and the British on the other, that was probably good reason for us to try to stay away.