Humans creatively believe that the time spent alive can provide meaning and value that out-weights the negatives.
Well, so we can't know, why the universe started, or why matter exists at all.
It just is.
Then also, all humans are an unbroken chain of living organisms that have been going a while. You are just a link in that chain.
So really, anything more we decide to put on top of this is subjective.
Now, we can choose to put some kind of faith in our own subjective choices (perhaps being alive is worth the difficulty and risk of it) or strive to achieve, or whatever really. I get lost in existential wormholes all the time, and it's really a kind of waste of time. Perhaps some sort of stress response as I do a very stressful job a lot of the time.
This is something I wrote about humans providing meaning to each other in some way: How is it possible to re-apply subjective meaning to any belief given a starting point of Pessimistic Naturalism: Nihilism
This is something about taking risks in life - https://www.youtube.com/watch?v=sX21TM6QFTI
And there is this french quote - https://en.wikipedia.org/wiki/Existence_precedes_essence
So, what this means is, you exist. First. You are. That's the starting point.
Then you have to decide what comes after. There is nothing intrinsic to being alive that makes it worthwhile.
Now, what are you going to do about it?
So, from the GTD outlook, you follow two steps.
- Makeup what you are going to do
- Do it
Bringing this back to your question. Why create more children. Well, and this is a very difficult thing for me to say, given I have struggled with your question all my life.
The answer is that we need other humans to function effectively. Evolution has left us in that state. Look at evolution? Can you imagine that if humans could function perfectly well alone the race would continue? Wouldn't everyone just sit alone in some room or go off to the forest to live in a hut or something?
So my point is, I'm not sure if we have much choice but to keep the chain / tree going. Perhaps...
Or maybe all children are just happy accidents or people believe ideologically that they should propagate.
In my eyes, we need a better answer than these two. https://www.youtube.com/watch?v=vsyZcKUP_-k
Benetar is too dark and negative, but perhaps logically correct in a reductionist fashion. Peterson is a scared christian apologist who doesn't really know what anything is, he just tells people to #get on with it and have some balls. Which can be a nice thing to hear, but it is not the be all and end all of how to live your life.
Perhaps the answer lies in creativity. We know that we all fail, and it is the only certainty in life (if you consider death as a kind of ultimate failure). So we need things like, love, hero's, adventure, triumph and striving in order to fill our time with something to do that is worthwhile enough to overcome the all children are just going to die outlook.
This was covered here - https://www.amazon.co.uk/dp/B00BSAC068/ref=dp-kindle-redirect?_encoding=UTF8&btkr=1
Hopefully my answer is equally as relevant as your question!