There are some people who are simply not cut out to be parents. As previously noted on numerous threads, it's a tough job. So it should come as no surprise that some people do not want to undertake it. And, if by chance they do undertake, then they end up making not only their own lives miserable, but making the kids miserable as well.
Let's get real, some people do not want butterfly kisses and giggles under the blankets. They want plasma screen televisions and to see Venice.