I was having the exact same debate with my dad. I was just wondering if people are literally born attracted to children in the same way that people are born heterosexual, gay or some people attracted to post boxes etc. If you look at it from the perspective, I wondered if there are people living their lives but also attracted to children really through no fault of their own who never act on their impulses. For people who cross the line, I would favour chemical castration since it would remove the impulse.
My Dad added that clearly everyone knows that paedophilia is wrong, so in order to be able to act on any impulse, a paedophile has to take the humanity out of it and see the child as an object rather than an actual person.
I ended by wondering whether that woman who was prosecuted at the Plymouth nursery was technically a paedophile since she was acting on behalf of someone else. Anyway I found it interesting.