“In fact it says if they can ‘legally’ use deadly force they must. Right?”
It’s their call. They were the ones being threatened with a knife, not you.
“To preserve and protect?”
To place themselves in harm’s way needlessly. Why would you protect a person trying to kill you?
“They aren’t but it is an option.”
That’s right, they aren’t, and to use a taser against a person using deadly force against you would be sheer idiocy.
The rest of your post descends into meaningless, raving lunacy as usual so I’ll just leave it there.
Well ya see, we the public, their bosses, get to review their actions and determine whether we like it. Then we can push for criminal charges, firings, retraining, fire the supervisor, fire the major, or riot in the streets.
So yes we have options.
Why? Because there are options to stilling a beating heart.