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16 October 2011 @ 11:54 pm
Joe -> Bob -> Harry -> Joe  
So Joe intends to shoot and kill Bob, and will succeed if not first shot and killed.

Harry intends to shoot and kill Joe in order to prevent Joe from shooting and killing Bob. Harry will succeed if not first shot and killed.

Q1: Assuming no further information, and that no shooting or killing has yet occured, is it ethical for Harry to shoot and kill Joe, to prevent Joe from shot and killing Bob?

Now, Bob sees that Harry intends to shoot and kill Joe, and that Harry will succeed if not first shot and killed.

Q2: Assuming no further information, and that no shooting or killing has yet occurred, is it ethical for Bob to shoot and kill Harry, to prevent Harry from shooting and killing Joe?

Now, Bob sees that Harry intends to shoot and kill Joe in order to prevent Joe from shooting and killing Bob, and that Harry will succeed in shooting and killing Joe if not first shot and killed.

Q3: Assuming no further information, and that no shooting or killing has yet occurred, is it ethical for Bob to shoot and kill Joe?