All these years of Assads murderous acts, with chemical or "conventional" weapons with America being weary and wary of mid-east wars and we Canadians ride along with that.
Suddenly ,sensing an opportunity to self-aggrandize, the American President does a 180 and attacks without  pause or consideration for future consequences, and we Canadians ride along with that.
What has changed in Syria to justify this sudden about-face? Nothing. American theatre-politics are driving the outcome of this growing disaster. And we ride along.