[harperlee]

I think the grandfather post is mainly saying that not thinking this through a lense of risk and reward, that can end up giving kids some good outcome is an error (and for sure having a happy father IS better than a depressive one, so if the cave diving risk is sufficiently low, then it makes sense to do it). This line of thought is also probably similar to what that guy thought (to think it is worth the risk to live like that). In that case, you have a slope of risk that starts reasonably and ends up unacceptable, but where you can't easily pinpoint where to draw the line.

Whether you "buy" the simple causal graph that he used as an example is a minor point.