I agree with you, Lisa Orlando, when you say that people who shouldn't have kids usually have them. I was in a small note-taking group at college last year where one woman said (when it was time to say something about herself), "I have three kids, and after having them, I realized I hate kids." I felt bad for her...but I thought it was, well, not humorous, but I can't think of the word, that she didn't think about it before popping out not one, not two, but three kids. Everybody didn't really say anything to her after that, kind of acted like she wasn't there. The worst thing about this situation is that she'll be responsible for these three kids the rest of her life, and the kids will probably find out sooner or later that she regrets them, and end up becoming bad parents themselves. But anyway, I feel bad for her.
And I also think society puts a bad image on the child-free, even the childless, if they decide not to have kids altogether. It's sad that everyone must generalize and say all people who don't have kids are selfish. Everyone's selfish in their own way, and not only because some of us don't want kids.