I have a somewhat different take on why the Catholic church is plagued with pedophiles.
A major source is the institutionalization of celibacy for priests. All human beings have sexuality and a healthy sex life is important in finding balance in life. If it is completely subdued and repressed it will manifest itself in toxic and distressing forms. I think the practice of celibacy should be strictly optional for priests and not mandatory. I think the long dark history of the church reveals that this is a deeply flawed practice.