The hostility comes from the fact that this is a conservative website that often discusses things like abortion,etc. The idea that people wouldn't want to have children sounds strange to some people. It really IS no one's business but they opened it up for discussion by putting themselves in a news article.
I agree that this couple opened the door to this discussion. However, I'm just not sure why people are so hostile to them choosing not to have kids. I don't really buy the idea that having kids is some sort of magical, wonderful thing. All it takes is a couple of drunk 16 year-olds and poor attention to birth-control.
In any event, these two do strike me as sort of whiny, but it is true that once your friends start having kids, your friendship is more or less over at that point.
I see this "no one's business" asserted on a few replies. I'm going to disagree. Formation of families and the protection of same is the foundation upon which society is built. Celebrating voluntary childlessness is a subtle way to weaken that foundation.
Similar the gay agenda; that can do as they will, but don't try to sell me on that "one choice is as good as another" nonsense. It ain't so.