Pure conjecture, so forgive me:
-Why would he want to teach? Because children are not adults and because one needs a living. Anyway, people change. I always considered his misanthropic statements to be exaggeration. Even if they were not, I dont think that is a stable position and it is bound to lead to something else. You cant avoid humans and human society entirely, teaching kids in the near-wilderness seems to be a good compromise considering that.
-Alcoholic and drug-worshipper: This sounds like an extreme statement from one who deliberately keeps away from such things. Also once again, people change, if only in their habits and the man says he had a kid which seems like enough impetus. Perhaps he renounced these? After all the phrase could apply to the man behind this site if admitted portions of his life are true (at the time).
-I think the man is a little old for teenage poon.
I have no solid argument to offer though, just gut feeling.