Well, you can throw all kinds of caveates out there for having kids too.
Parenthood is more than being horny, which for most of the world is about all the thought that is given to it.
But the people I see in this article are not trailer park welfare queens. They are professional, productive people who may have in some instances made intelligent decisions.
But their decision not to have kids simply can not functionally be the model for as much of the population as it is being promoted for.
The normal state of couples is parenthood, and the reasons for not being parents have nothing to do with global warming or not having enough time for yourself. Those are stupid, selfish reasons and if that is all they can come up with they need to grow up.
Chances are if you can tolerate a spouse and a house, you can tolerate parenthood.
It's not immature though to not want children. Not everyone has the desire to raise kids. Why is that so tough for you to understand?
I actually agree with your first sentence but not your second. We shouldn't be in any position to feel the NEED to scorn either the child-rearing life or the childless life. Neither side should need a support group or a political action committee, we should just let people be.