1) The reason why baby-posters are so pro-baby is not as much about natural selection, but more about different kind of filter: the one who is NOT pro-baby is l

1) The reason why baby-posters are so pro-baby is not as much about natural selection, but more about different kind of filter: the one who is NOT pro-baby is less likely to write about babies. Not that it matters in the context of this discussion though :-) 2) Wife can not only produce more babies, but also raise existing kids, support the family (financially and otherwise), and more. The same is applicable to the husband. 3) Internal thinking affects your behavior. A lot. So if you think that your kid is THE MOST important thing in your life -- you are more likely to make mistakes and bad choices.