Self defense is probably one of the best ways to get away with murder. We all kill to survive. Even if you a vegetarian or vegan or whatever the newest fad is. (Fruitarian, really?)
In the hierarchy of needs, survival is one of most basic needs. One that can't be conquered. Everything is forgiven if you do it to survive. People have cut off their own arms, killed others on a boat to eat them and other weird unmentionable stuff.
People who, hence, commit suicide are, according to me, self-actualised.
Since I have people who over react as friends, I am not depressed. I am not contemplating suicide. Also, I am not disappearing from twitter for a day after talking about this. *snigger*