YES, I have a personal reason for asking.
There is a group on Facebook called B*stard Nation, they do not think very highly of adoption. The members are adoptee's, they went an adoption website and told a woman who was considering giving up her child for adoption not to because it would ruin the child's life.
They seem to disagree with and dislike people who say they are "Happy Adoptees" A lot people on the WWW say happy adoptees are in a fog.
There are a lot of adoptee groups on FB that seem to disagree with adoption. however most are closed groups but you can get the idea either by the name of the group, for example Abolish Adoption.
Would they prefer never to have been born or to live with a parent(s) who didn't want them?
Our daughter belonged to a therapy group of adoptees. There were nights when adoptive parents and bio parents were invited if the bio parents were known. One thing that came up often when adoptees were bitter is they had a fantasy notion of who and what their birth parents were. They would resent their adoptive parents as though these people had ripped them from a happy home. The attitude was found even in older adoptees in their 30s and 40s. Once some of them found a birth parent, they realized that the parent(s) lives were not fairy tales or they came to accept the parents were not at a point where they could have cared for a baby. Others came to realize how lucky they were to have parents who loved them through the group therapy.
From what we learned, almost all adoptees go through a grieving stage where they mourn the loss of their birth parents and feel abandoned no matter why they were put up for adoption. No matter how much adoptive parents love their children, IMO, for both their good and the good of their children, some therapy should be sought. Kids sometimes will try to hide their feelings from their parents because they are afraid to hurt them. If a child begins to act out, it could be due to them grieving or struggling with their adoption.