I have put together an article on Martial Arts and the use of Violence in Martial Arts. The article discusses systems like Krav Maga, Systema and traditional Japanese Martial Arts.
"There is a saying that the use of, is often attributed to the founder of Krav Maga Imi Lichtenfeld. The saying is -- "If a man comes to kill you, then kill him first". On the face of it, it is a pretty logical response. Indeed, even the Dalai Lama who many look to as a source of theology on Pacifism is also recorded as saying on one occasion when interviewed on a radio station -- "If someone comes to kill you with a gun, it would be reasonable to shoot them with your own gun". For many people there is no question at all that in any case where self defence is required you are justly entitled to do what needs to be done in order to defend yourself". -
Continued at the posted link.