Personal observation only. Though i'm a psychiatrist and see a lot of children.

IME, only one adult out of 20 should be allowed to parent a child.

After interviewing the child, then the parent, the pathology is usually present in the adult.

Most adults I encounter are messed up. Most children, even those identified as troubled, respond beautifully in an environment where they are loved, respected, and engaged with.

I see this every day.