Some people were abused in various ways in an “attempt” to get them to stop presenting those traits. Calling friends parents, teachers, etc about thing that really should have been private (if not in fact grounds for CPS interventions), physical abuse to try to “break habits”, physically breaking objects associated with the child's special interests, etc.

Learning that you were not, in fact, a horrible and wicked child that your parents had to endure is life changing.