@ChazMaz
I’ll start out by saying that I do recognize that you were just trying to bring the other side into the conversation. But I personally believe your metaphor to be faulty, and your assertion that we are here to procreate overly simplified.
Firstly the metaphor. Your stop sign metaphor assumes that a mother-father-child setup is an inherent universal some how. There is actually little example of this anywhere in our history. In most cultures child raising is done by large groups of people, the infamous “village”. My understanding is that the isolated nuclear family is a rarity in most societies. The norm is to have aunts, uncles, grandparents, even neighbors taking a very significant role in a child’s raising.
Your metaphor falls short, and in actuality would look like a driver in a car stopping at an intersection assuming they need to stop, only to find out that there was no need. Or more complicated than that would be one town using red stop signs, and another using green, and both of them of the opinion the other is wrong, even though everyone is ultimately taking care of road safety in the same way.
And now for your comment on our goal on this planet is to procreate. This is true in a sense but overly simplified. Our actual goal is the continuation of the species. This involves a lot more than a guy and a girl “doing it” and raising their children. This is why we develop families and communities. The ultimate goal is not for one child to survive, not even just your children to survive, but for your community of children to survive. Of course this is also too simplified, but at least it doesn’t allow for a simplified nuclear family being the end all and be all.