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Unfortunately, any category of organization where adults have authority over children will have some level of sexual abuse. Our daughter's fancy--and extremely progressive--private school recently investigated itself and concluded that it had protected teachers who had relationships with students over several decades: https://www.capitalgazette.com/education/ac-cn-key-school-in...
Indeed, studies show that sexual abuse in schools is extremely common: https://en.wikipedia.org/wiki/Sexual_harassment_in_education... ("In their 2002 survey, the AAUW reported that, of students who had been harassed, 38% were harassed by teachers or other school employees. One survey that was conducted with psychology students reports that 10% had sexual interactions with their educators; in turn, 13% of educators reported sexual interaction with their students.").
Your points about the Boy Scouts are will taken. Coming from the opposite side of the aisle, I would say something similar about what happened at my kid's school. It was an outgrowth of the school's liberalism--specifically the male-dominated sexual liberalism of the 1970s and 1980s that tried to normalize sexualization of teenagers. Teachers would have parties and invite students--this is a K-12 school mind you--and relationships between students and teachers were open secrets. It's not that nobody knew, it's that nobody thought it was a big deal.
But the larger point is that sexual abuse happens in pretty much every class of organization, though the specifics are different in each. My complaint is that the media reports on sexual abuse in churches and Christian-oriented organizations in a very different way than when the same thing happens in secular and liberal organizations. And that's not actually good for anyone.