Except for maybe Judo, that's true. And it means you fucking better have a handle on the assholes you are teaching or you are negligent. In the Army, they call this Military Ethics, and they have endless boring lectures on Laws of Conflict, and Rules of Engagement. If you don't have Abraham, Jesus, Mohammed, Buddha, or a fucking nice grove of trees in the woods to guide them, you better teach them the Criminal Code and the Charter of Rights. If they **** up and misuse the technology you gave them (in exchange for fees) then the responsibility is yours.
Let's not forget the whole point of martial arts is technically to kill people when you didn't have your killing implement handy. All "sportfighting" was originally designed to develop BETTER killers.