I haven’t seen the entire video. From that link, it jumps around, and is in very poor focus or resolution.
Contrary to Texas and Nevada police haters who clearly have a problem with cops, police officers don’t just show up and shoot someone for no fucking reason whatsoever. Sure, mistakes happen, training fails, and more, but no one simply tries to “straight up murder someone and lie about it.”
Without better evidence, and without waiting for the investigation, I would suggest that the subject put the knife to his body somehow, threatening to harm himself. In some agencies, this is justification for shooting and injuring the subject, so they can’t harm themselves. Perhaps just refusing to drop the knife was enough. If don’t don’t comply with direct orders, the results can be catastrophic. Without audio, it will take a while to determine exactly what was said.
Yes, that can sound counter-productive, but an EDP with a knife can certainly kill themselves very easily, whereas a gunshot isn’t a guaranteed kill.
No, you can’t shoot the gun out of his hand without snipers as some would opine.
And a leg or arm shot may not disable the subject.
4 rounds? Standard. Cops don’t shoot once, see if that hurt, check email, then try again. Cops shoot to stop the threat, until the threat is stopped. Sometimes death occurs, but it’s not their intent.
It would seem - pending further evidence - that they chose the lesser of 2 evils facing them.
All of you cop-haters should try a ride-along sometime. I should imagine your eyes will be opened to a great number of things.