You're correct, pedophilia is a mental illness. A very tragic one since there is no hope and no cure. They can't even ask for help because everyone will automatically assume they are also child molesters. Which is what you're describing, but not all child molesters are pedophiles, and most pedophiles will never become child molesters... Like you said, some people just get off on exploiting the power dynamic and aren't necessarily sexually attracted to children. Those people are the real danger.