I have a carry permit. If someone tries to shoot me with a tazer it is legal for me to kill them. So no I wouldn't or I should say shouldn't be prosecuted. I have a legal right to defend myself.
It really all comes down to self-defense. And I think that’s what this situation comes down to also. A few things:
1) You have to use force proportional to the force being used against you. That doesn’t mean the same weapon. For example if someone is beating you senseless with their hands and you shoot them you’re ok. But if they shoot you with a sling shot or throw some rocks at you, you wouldn’t. (That would change if they were beating you with a large stone, obviously.)
2) Imminent danger. Are you in it? Someone coming at you with a taser or other less-than-deadly weapon may indeed mean you’re in imminent danger. But if they just have a taser but are running away, or have already discharged it and can’t again (not sure how all tasers or stun gun work, so please educate me if need be), it is a little different.
3) Are they fleeing? Generally, most places don’t require that you retreat. The initial aggressor generally carries the burden of “starting it.” But if they retreat, can you chase? On your own property, you can in many places (the “castle doctrine” is sometimes what it is called).
I really want to see a better view of the last 5-10 seconds. Was the guy running toward another officer or civilian? Did he competent turn and then begin going back at the cops? Or did he half turn and fire the taser and miss? The more I think about it the more I believe it will be very difficult to find the officer gusty beyond a reasonable doubt largely because the guy had a taser and (it seems) actually turned and intended to fire it. So much if it when it comes to self-defense goes to mindset and legitimate fear for life or serious injury.
But, I still think the officer’s actions were not an appropriate use of force under Tennessee v. Garner. So his firing was appropriate, and I think the man’s family likely has a good Civil Rights case against the department. That Tenn v. Garner case was not a criminal case, it was a civil case. Which I think is pretty important to remember.
Oh, and I don’t think the officers were motivated by race here. I think race played very little roll. This was more situational than anything.