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I had one instructor who called it the CYA rule. Can You Articulate?

Can you articulate why the mugger at arms length with a knife needs to be shot?
Can you articulate why the robber across the room who just murdered the store clerk needs to be shot?
Can you articulate why the suicide bomber 25 yards away running toward a school bus full of children needs to be shot?

It doesn't absolve you from the responsibility for your bullets if you miss. However, if you make the shot and can articulate why it was necessary, you really stack the deck in your favor for what follows.