1. It is part of the lifecycle, it is part of being an adult. The link at the top is mislabeled, you can't be an "adult" and not have kids. Yes it's grueling and miserable, but discomfort grounds you and gives you perspective. People that never leave their comfort zone never grow... they don't "grow up".
2. I personally believe it is the key to immortality. I'm not talking reincarnation or ancestor worship. Just a mental image I have every being that lived and died since the beginning of time to create me (or you), like threads in a fabric, and then you don't procreate and it's like "snip" and that thread ends.