Its been realized in some of these situations similar to the one I mentioned, that people have gone on to a psychotic episode. ???
If I'm being attacked and my life is in imminent danger, I'm not going to ask my attacker for his meds list or the name of his psychiatrist before I defend myself.
If I have one or two seconds to decide my fate, I err on the side of saving my own life rather than a thug's.
Whether you're killed by a nutjob or a sane person, you are still dead.
[edit]:
finklestein, I see your view and appreciate it. If there is a non-violent, non-lethal option in a self-defense situation, then a person should take that avenue first. However, it's very easy to be an "armchair quarterback" and assert what you would, or wouldn't do, if your life is threatened. Fear, adrenaline, etc. all change the game, and what we think we'd do and what we actually do are often worlds apart.
Self-preservation wins everytime.