preferences are not immutable

Ultimately, we all (including our children!) have to do what we ourselves think best, what feels right to us ourselves, not what someone else says is right. We are all moral agents in our own right. When we self-coercively override our own wisdom and do what someone else thinks we should be doing, we are acting wrongly by our own lights. No good can come of that. Treat this site as a source of speculative guesses and interesting arguments, not as an authority you should obey.