Well you have nearly the complete story. Church is about control: if you help someone hide his crimes, they have acess to repeated rape and you have control over them because you can always expose them. It might even build loyalty. Case and point marriage and celebacy: probably the only thing threatening the churches control-by-faith is the drive to protect your spouse and children. So they are not allowed to have them. Bonus round: why is there a concept of “sin” and “confession”? Because this helps the church know all the dirty secrets of powerful people and their loved ones. The rest is history (blackmail).