Having grown up Catholic (directly across the street from the Cathedral), involved in music, theater and sports, I can offer my view. I also have degrees in sociology and psychology and have considered the question, both on my own and as spurred by the topic interwoven throughout the forum.
After considering it for a while, Scouting is unique even amid other many other vulnerable activities involving adults and children, before the late 1980's. It occupies different category because of the sheer range of activities that create opportunity. We had/have swimming, overnight camping, hiking,