Well that's you're opinion - we will have to disagree to some extent,
depending on what physicist & biologist you ask.
Hmmm I note you didn't address the cop one.
a citizen watching video of a subject with a knife coming at an officer in a living room.
Officer draws and shoots the subject.
Citizen "Cop could have shot him in the leg. Arm, he didn't have to kill him"
Cop " Suspect was 10' away and closing fast, it's difficult to hit a moving target, if you miss the leg, you get stabbed. If you hit the leg you may get stabbed. Cop didn't actually shot to kill him, they shot center mass hoping to stop the threat."
Different opinions, which one carries more weight?