Just to introduce a bit of drift....
From one of M58's responses in this thread
"If I am in a C-Store with five other people and someone pulls a gun on the clerk I have no reason to respond with deadly force."
Anyone care to comment on this?
To me, if someone pulls a gun on someone with criminal intent, they have expressed their willingness to use deadly force....and they have the ability to carry that out in less than one second.
If someone pulled a gun and pointed it at me I would feel justified is using deadly force as soon as possible to stop that threat. Thus, if I would feel justified in protecting myself in that situation, I would feel justified in doing so for someone else in that situation.
Now, that means it is justified, but would I get involved? I have to say that I would.