Well, for one, you're conflating situations where people have made decisions (to become a priest, to be Christian, to be Muslim, to be a terrorist) with situations where people have made no decision (to be gay, to be a pedophile).
If we had a thread about being Black (akin to the homosexuality thread), and some members just posted examples of random black people committing crimes , would you see the issue? Do you see the difference between that and posting examples of crimes committed by people who choose to be extreme fundamentalist Muslims who commit crimes in the name of that extremism? If you do, then perhaps you can understand the difference between someone posting about the crime of a holy man who is using his religious status to abuse others in contradiction of his teachings, especially in a case where these religious institutions have themselves worked to cover up similar crimes in the past - thus implicating the entire hierarchical structure of that institution, and someone randomly posting crimes committed by people with a particular sexual affiliation.