Anonymous Coward and all the apologists for this act.
As the people defending the mounties haven't even done the most basic of checking, I looked up the article on news websites. The knife in question had a 8cm blade. Now, bearing that in mind, we're looking at a penknife or similar. Might be sharp, but not exactly a special forces killing knife. Also, as he pulled this from his trousers, it rather questions the competence of the staff in not spotting the knife. He had been in theatre!!
Now, to tackle anonymous coward and his fantasies.
The oxygen pipe is not likely to be an issue. Firstly, they only let out a trickle of oxygen, not a gushing torrent, so the oxygen levels in the room would be unaffected even after several hours. Stragely enough, any oxygen he doesn't breathe in escapes into the room anyway!! So, no fire hazard outside the very immediate area. These things are also designed to come off easily and with no damage in the event of being caught. So, no risk to the man either. Your first point is total rubbish. Additionally, once subdued, they would simply reattach the oxygen. Clearly any time he is without it, is not good, but the time involved would be short.
Whilst I appreciate all the loony lefties etc. try to claim there is no such thing as an accident and are under the delusional idea that life can be risk free, in reality they are wrong. Life is full of risks and if you become a police officer, it stands to reason you accept these risks just the same as if you joined the military. If a police officer is this scared of risks, he should resign and take up knitting. He's clearly not up to the job.
The police have tools specifically designed for tackling people with knifes, not including a taser. Side arm batons are one such weapon. Police officers are supposed to be trained to amongst other things use discretion. That means to pick the appropriate tools and actions for the situation and not simply use the standard stock answer which is rapidly becoming the taser.
The taser has a place and should be used in certain instances, but all evidence shows that police use it constantly for the most mundane arrests and actions. This is not good and should not be tolerated. Because it's seen as so safe, it's use will continue to rise, but there is an increasing body of evidence that whilst safe for many, it can be dangerous and can easily kill.
Anyone who thinks this action by the mounties was correct should roll themselves in bubble wrap, never interact with anyone else and stay inside their homes. To be honest, I'd prefer they did and leave the rest of the world to people who actually understand reasonable force.
Before anyone asks. I most definately understand what I'm talking about and don't need that rubbish thrown at me.