How about poor tactical training on the Toronto Police? Or the fact that this officer has had issues where his gun was drawn too many times (this is actually recorded and known. It was recommended he go through some kind of counselling but it's never followed up on), yet was still allowed to keep his gun and respond to emergency calls?
Sure he's a bit of a trigger happy nutjob, but it's the failings of the force in general that is the failure regarding training or designating someone fit t be a cop. Also, more officers should be allowed to have tasers. Not just the bosses.