But given the option of teaching someone nothing or teaching them this?
But that isn't the question.
I think it's a net gain for them to learn how to change their mind.
I think it is a net gain for a person to learn the arguments of Christian apologetics, that doesn't mean it is worthwhile for everyone to learn the arguments of Christian apologetics. Time is a limited resource.
I've taught aspects of rationality to lots of people because I like talking about it too. But my friends and family have learned it as a side effect of doing something they would be doing anyway, having interesting conversations with me. Some of them are interested in things like cognitive biases and learn on their own. But we don't yet have anything here that makes dramatic differences in people's lives such that it is important they spend precious resources on learning it.
ETA: That was a bit brisk of me. I think we just have different definitions of "worthwhile". :-)
If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
If continuing the discussion becomes impractical, that means you win at open threads; a celebratory top-level post on the topic is traditional.