Why are there so many negative people in the Adoption section?

I've noticed that too. I don't really understand it. I've known several people who were adopted (some are family members and some are not). I know one at least had bad feelings about it, but his adopted parents were both alcoholics who didn't show any interest in their kids. The majority of people I know who were adopted are in loving families and they are very close to their parents. It does seem tome that a lot of adoptees with bad experience are in the adoption section.