There are plenty of children being made as it is. If someone wants to make it her/his vocation to raise a family, I'm not gonna stop them if that's what makes them happy, but I don't see any need to have any of them myself.
Beside, I don't hate children. I have good moments with my nephews too. But this! Everyday! All they long! For years! Now that's just waaaay too much for me.