I take issue with this post for multiple reasons. First, needing to defend yourself is a low base rate occurrence for most people. So, by your definition, a Sensei who has trained for twenty years but never had occasion to defend him/herself, is not a true martial artist. Second, as someone who HAS used his martial arts training to defend himself, your logic leads to a slippery slope. I primarily used BJJ to stop my opponent, even though I'm actually not that good at BJJ and am much more comfortable with Karate and Aikido (caveat, I did have the opportunity to strike, but chose not to because I didn't want to hurt him). So, by your logic, am I neither a true Aikidoka or Karateka because I haven't used either in hand-to-hand combat? Does my Sensei not "know" a given technique unless he has applied it in real life? Where does the "used in real life" criterion end?