Yoshiyahu
Master Black Belt
Also lets not forget the battlefield of today. Lets say you go out of states an are attack by terrorist or your in Army and have to fight hand to hand combat. Those techniques may say your life. Or what if the day comes that China or Islam invaded America and their were Islamist blowing up homes around you,shooting people on sight and beating people down in streets with their fist. Would you hold back those techniques if your surrounded by some funadamentalist taliban who want to beat you to death with their bare hands because of what you represent. Remember you in the midst of invasion? What then morally speaking of course. Because at the point the law of land won't apply?
Um on the battle fields of old when you were engaging in hand to hand combat of kill or be killed.
As a Martial artist you should have the ability to use the correct amount of force needed to stop your attacker. You do not need excessive force to accomplish this. Your question in some way is asking when is it ok to kill someone? I suppose in an extreme situation such as a guy trying to kill you(thinking serial killer here) Then performing excessive force to ensure your surivial might seem probable.