Sex abuse thrives wherever it gets a chance and in the past those in any institutional setting had little power against those in power.
Sex abuse was prevalent in Care homes, Social Services, boarding schools, Scouts, sports clubs the armed services and in religious establishments. Anywhere where one group had unfettered power over another.
Paedophiles seek out these institutions and choose the careers that will maximise their access to vulnerable children and young people, and I include training to become ministers of religion. Not every person who enters the priesthood has a vocation. They can have other motives.
In the past because the subject was not talked about, mainly I think because the vast majority of people where so repulsed by it that they could not bring themselves to believe that it could be other than a very rare event, this led also to a tendency to hush it up, it was felt that the perpetrator must have had some breakdown to do anything so vile, that it would not be repeated and once they had gone through some kind of treatment or recovery they would not do it again. WE now know this was wrong.
The effect on the victim was not considered because at that time the affect on the victim of anything, violence, death of a parent, murder of someone dear, sex abuse was not considered.
I quite agree that a true understanding of the damage sex abuse does to the victim and also the deviousness of its perpetrators has been slow to be accepted by society as a whole and one hopes that the conversion and understanding is now complete,
I think it is invidious the way particular institutions are picked on for shock horror exposures, in truth what happens in one is common to all. I note that the institutions chosen are always religious, and always Christian. I wait an exposee of abuse in other religions and secular institutions, many of whom have/had bodies within them that are identical to the bodies that bred abuse in churches and where it is already known that abuse happened within them.