Catholic priests do not diddle more than any other group that is commonly in a trusted position around children such as doctors or teachers. It's true that rather than quietly move the pedo's around they should have quietly introduced them all to a woodchiper, but the public perception of pedo priests is out of line with reality. There are many cases of schools, unions, and basically any organization that you could think of covering up the sexual assault allegations for their members. The key difference is that the Catholic church has morals and so it's faithful expected more of them and it's enemies saw it as an opportunity to attack. This many years after the crisis when the church has done so much to introduce safeguards to prevent similar circumstances from occurring again, I believe that most people who bring it up are just looking for a way to attack the church because they don't like that it stands by it's teachings, especially with regards to abortion and homosexuality, rather than because they are actually concerned about children.