Pedophilia: nature or nurture?

Have you ever known an ex-pedophile?

If we accept the premise that non-pedos can become pedos (that is, they aren't all born that way), then we have a situation in which normal people, WITHOUT EFFORT, adopt an abnormal sexuality. It seems reasonable to believe that, with conscious effort (not that the tools to carry out that effort are necessarily obvious), an abnormal person could regain a natural and healthy state.

But then I'd have to bump a two year old thread.