As far as I've always learned....in a true life and death struggle......the SEALs have said it best.....

If you aren't cheating.....then you aren't trying!

There is no such thing as a fair fight when it come to life and death. To borrow from a book I like.....Fiar means all of my [guys] go home in one piece and F*%* everyone else.

Now on the back side of this discussion....Years ago I had the privilage of playing paint ball with a number of people. One person had invited thier mother along. She was a demur quite type who wouldn't and hadn't 'hurt' things. She tried no to kill the spider or fly.....that sort of thing. Let me just say that by the end of that first game......she was a different person. And I don't mean just for the game. Her outlook in life changed. By the end of game 4, she had no qualms about using force if the situation called for it. It seemed to be a sobering experience for her.