Yes I think we won't get far with this discussion indeed. Everyone comes at this from very different backgrounds, literally.
It is public transportation, whether Joe or whoever sees it like that or not.
It seems more a divide between people that never or only infrequently fly First or only because of miles can afford it and people that can afford it more freely, fly it a lot, and for whom First is really the only way to travel long haul. Saying that first is like a luxury retaurant and that with a child I should go sit in "a perfectly acceptable family restaurant" (I assume CW is meant? I hope not Y) is insane. Who decides what is perfectly acceptable for me? And I don't see it as a luxury restaurant or experience, I just see it as a bigger seat or area of space for me. If I want nice food I will go to a restaurant and it will always be better.
I agree that you should choose whatever airline you want but I don't think there are any that ban children, at least not the AF example given. They are very friendly to families.