You know, that's a really good question. I don't really hang around people who are of the type to go breaking into stuff, so I've always felt pretty comfortable teaching those I know to pick locks. I've taught a whole ton of people the basic skills of lock picking in "real life" (as opposed to ppl from this site that I've worked with via PMs and emails). Probably at least 50 by now. So.. is it possible that I've taught someone that will, at some point, misuse the skill? Oh probably. But I've always been responsible in my teaching, and I've taken every *reasonable* precaution to ensure that those I teach will not abuse the skill. Beyond that, people make their own choices and I don't lose a lot of sleep over it.
If I taught someone how to hammer a nail and they later beat the snot out of someone with a hammer, I don't think I'd feel all that personally responsible either.
db