> When it comes to children, then, the question is not just "do I want my child to hear better than I can", but also "do I want my child to speak the same language and belong to the same culture that I do" - something most parents want very much.

That's simply: 'what is best for my child' vs 'what is best for my relationship with my child'. Only one of those actually has the best interests of the child at heart. Only one of those opinions is respectable. Growing up with the latter leads to resentment towards the parent generally.