Here's a great piece, summing up a few thoughts I have nicely:
A quote - 'So what are the stupid life choices? Almost all social violence happens in four kinds of places:...'
Just started (on another long flight) a book by Mark Hatmaker - No Second Chance. He also stresses awareness and attitude as keys in avoiding the use of violence in your defense. I will review it later (probably next month).
Until then, train hard and train smart.