There is a halo of virtue around family. Procreating and having a family is seen as wholesome and good. It certainly is a natural instinct to procreate and have a family. The desire to have children comes from our biology, our evolution. However, other natural instincts include aggression, murder and rape. We acknowledge the cruelty of "nature" when we see animals animals in the wilderness attack each other, but why do many not acknowledge that humans are animals too who naturally oppress one another for the sake of selfish gain? Nature is cruel and leads to suffering. To reduce suffering, we need to go against nature.