In my view, having kids is a great way to take off the existential pressure of life being meaningless, by just having a default "do it for them" answer to every single question or hardship in life. And what then will give your child's life such a straightforward meaning? Well, just have kids of their own I guess, and their kids the same, all the way down, forever.
It always seems like a bit of a cop out to me. "Life is empty and meaningless, so I'll just have kids, let that fill up all my time, and maybe they can figure it out." I suppose that could be the history of humanity in a nutshell.