Septimia
From reading the article he sounds (and looks) an unpleasant character.
Don't forget that such predators turn up in all walks of life. DH came across some offenders among teachers and university staff. They're also very good at compartmentalising their lives and may be very good at their job while doing unspeakable things on the quiet.
Look at that animal researcher in Australia convicted of doing unspeakably awful things to dogs and other animals.
People like this seek places where they can get access to children. They become priests, or nuns, or teachers, or youth leaders, not because they have a vocation to do those jobs but for the access they give to those they want access to.
I think for a long time those in authoritywho did not have those proclivities themselves just did not realise how hard-wired these desires are and saw those who had abused children as people who had had some sort of breakdown and fallen below acceptable standards for a period of time and who, with proper help and support would not, so to say, sin again.
Now we know better. I think also, in the past, those in authority had no idea how serious were the effects on the victims of paedophiles. I am sure most of us remember the jokes about vicars and choir boys, we just did not know or understand paedophilia.