Police and the "shoot people with knives" email

A big fuss has been made of a email that circulated regarding Cops and peopel with knives. For context here is the full email below without hte photos (I dont want to make this site R18)

also I note that it's actually not a police officer. It's believed to be the result of inmates fighting inside a prison. (http://www.snopes.com/photos/gruesome/kunsan.asp)

The photos are of an officer trained in hand-to-hand combat.
The officer thought, due to his size and fighting skills, he could disarm a knife wielding aggressor.

Here is why I am forwarding these on.

To all the idiots out there who always say, "Why did the cops have to shoot him?
He only had a (insert your choice of weapons here, i.e. knife, bat, club. whatever).?
He didn't have to be shot.

To that, I respond, "tough crap ... shoot'em".

If an officer tells you to drop your weapon, just drop it.
If you're a retard, stupid, on crack, mental or just "scared" ... too bad.?

No one deserves what this cop got for just doing his job.?
If you've got a knife, then you should die ... period.

This is vivid proof of how deadly people who are "only" armed with a knife can be.

Some of the public think that officers should try to disarm someone armed with a knife but anyone who has had training in knife fighting will tell you - even if you win you are going to get cut. Keep this in the back of your mind when confronting someone armed with an edged weapon.

There is a bit more context to that email that it has been suggested in our local media. Clearly the person is suggesting you shoot a person whi is acting agressively with a knife desipte instructions. Of course even that might be too much, but how peroic do we want our police to be?