Institutions were notorious for sexual abuse because it was more talked about now. But sexual abuse happens just as much in homes and non-institutional places. It's just less talked about.Yes I know. But for years and years residental insistutions like orphanages, schools and "homes" for mentally retarded folks, were really notorious for sexual abuse.
As a matter of fact, I seem to recall reading that the Public Schools (the really ritzy boarding schools in the UK like Eton etc) back in the old days were hotbeds of rather unsavory sexual activity.