Having a child
would be a horrible thing for me. Not everyone wants to parent. And to be honest, I think having a child is much more selfish than not having one, because it's all me-me-me.
I want to pass on my genes,
I want to feel what it's like to be a parent,
I want to fit in with the rest of society,
I want someone to care for me when I'm old. I could go on for years. Many people stay childfree for selfish reasons like more money, spontanious sex or sleeping in on the weekend, but don't put parents on a pedestal: they are just as selfish as the rest of us. You know why? Because in the end, we're all human. And that's okay.
I don't want children, because with that freedom, I can do a lot more for the world, rather than having to care for a single person 24/7. And if people like Mother Theresa and Jesus are immature, then I'm going to take that as a compliment
And finally, I don't really understand your concern for the extinction of the human race. Have you
seen what we've
done to the planet? We're not an asset: we're parasites, and no other species is going to miss us. It's an invalid arguement anyway. There will always be people who honestly want children, and said children will then A) be welcome, and B) have a cleaner planet with more resources. Everyone wins!
P.S: if my parents did not want children, you would be talking to
them now.