Well, if I have to use the study’s terms:
The “Homosexual Community” (in this case, Roman Catholic homosexual priests) committed the abuses.
The Catholic Church (in this case, bishops, other priests) aided and abetted, and hid these abuses. They fostered an atmosphere where it could continue under everyone’s radar.
What you have to remember is that hiding sexual abuse (especially against children) was the traditional way of handling it up until the late 1970’s.
My second grade teach molested one of my fellow students and was permitted to resign and move on with his teaching certificate intact. That was 1967.
You must also remember that the Catholic Church is like any old bureaucracy in that it is slow to change ways of doing things that has been successful for a long time with out good reason.
Transferring a Priest that has been caught violating their vow of celibacy worked for many decades if not centuries.
You can also think of Priest like any other society of professionals that police themselves (think of lawyers and Judges) they are not usually going to severely punish one of their own unless they are forced to do so.
Priest and Bishops (who are Priest don’t forget) are humans and can be expected to act like other humans in similar situations.