Its one thing to shoot someone, surely quite another to empty your clip into him? Right? I mean this strikes me as a not unimportant point here.
That's another thing that liberals don't understand.
Many many times, in shooting situations whether it was cop vs criminal or civilian vs. criminal, what we have seen is where a person says they fired three shots when they might have fired as many as ten. This comes from the "survival" instinct where your mind doesn't accurately record how many times you squeeze the trigger.
Besides that, if the criminal kept coming at the officer, the officer has just cause to keep firing.
For deadly force to be reasonable at all, the officer would:
a.) need to genuinely be in grave danger
b.) have no other milder method of achieving the same result (making the suspect unable to harm him)
I understand for someone like you who desires a return to the Wild West, this may be unconvincing, but it's the generally accepted standard in most of the civilized world.