I'm not saying a trick shot was in order; I'm not blinded by what I see in Hollywood; I'm simply saying that if any shots were necessary at all, four was too many and clear the intent was to kill,
Yes, that was exactly the intent. He wasn't shooting her to wound her. That's my point. Four isn't too many when the goal is to kill the target. If they died, that was the right number of bullets. Now whether or not she should've been killed, instead of brought down in another manner, that's a separate question/issue from "was 4 shots really necessary?" the answer to that, per most police standards is "since the goal was to kill the target, yes."
and I'm not sure a child with a knife, however threatening, warranted death at the hands of a grown man if a taser was viable option.
That's the problem though, was the taser a viable option? As it's been shown in other cases, they aren't a perfect response to try and take someone down.
And you're not sure if the child warranted death at the hands of a grown up. Well, I'm sure the girl in pink, didn't warrant death at the hands of a girl with a knife and...whatever had her so worked up that she felt stabbing someone was the appropriate response.
I'd much rather learn she was tazed and subsequently fell on the knife and died, versus she was shot four times and dropped the knife because lack of life made it impossible for her to wield it.
I'd rather learn that too. But what you also might have learned, since we are talking hypotheticals is "a girl was stabbed to death by one of her friends, after being tazed. Sources report she didn't respond to the deterrent, nor to the officers repeated orders to stand down. When tazed, she had enough momentum to still carry through with the swing, and fatally wound the victim." And that's where the grey area comes into these type things.
To be clear, I am 100% in favor of non-lethal, I hate guns, and think they should all be removed entirely, and the world would be a much better place if not only we didn't have them, but we also had a species who didn't WANT them. But I also appreciate that we don't live in that world, and sometimes situations can be too chaotic to handle without risk to lives. And that sometimes, the only option available is deciding who will die. It sucks, and I hate it, but the girl with the knife wasn't helping the situation at all. She was in fact, the root cause of the entire situation. You keep asking "why didn't the cop taze her?" I keep asking "Why in the hell did she keep trying to stab someone even after cops had shown up? Knowing full well what was going on? Unless she simply wasn't actually aware on a certain level?" *shrugs*