I believe nurture does indeed play a bigger role, but I'm not sure if every single aspect to a person is covered by it - some things would be nature, and it's altogether possible that in some instances, the things people are "born with" are things that others view as abnormal - any number of crimes or simple social problems could be seen this way (with media/society being all too quick to blame the individual for suffering from something they had no control over).
As for people gaining paedophilic tendencies through children being dressed up like prozzies/adults in general, I'm not saying it automatically does make others see them as adults and attractive - that would indeed be too close to the "It's not rape if you wear a short skirt." argument. I guess what I'm trying to say is that parents are treating their kids as grown ups, the kids want more and more to seem older, and the end result is that people of a certain mental state end up getting mixed signals and very confused. It hasn't made me lust for kids either, indeed that style of garb makes me like them even less (and they already weren't on a good level). But in some cases it has. In a thread on
a very reliable source 4chan, someone had mentioned child pornography. One reply was "Well how am I supposed to know they're only 6? They dress just the same as a 30 year old!"
Sure, that person was most likely just being stupid (it's the Internet, after all), but there is a bit of a problem (although the bigger issue is simple confusion in the case of "From 17 to 18, there is no obvious sign of change." - the grey area where someone may or may not be legal, and someone gets in trouble for showing interest when it later turns out the subject of their affection is in fact underaged. I'm aware that that is a separate matter, though).
In general, the point was that not everything can be helped by therapy and drugs. In some cases, a person thinks in a certain way because that's just them (a hard one to be sure of, seeing as you can really only gather how someone thinks when they can have a conversation with you or do complex enough things that watching them will give you information - by this stage, they already could have changed so much due to their environment), or because of outside factors that are still present and not going away (example: people in high school compounded my depression and made me suffer from psychotic episodes. They weren't going away, seeing as school shootings weren't fashionable back then. The problem could not be solved through talking to people or taking antidepressants, both were tried and failed), and in these cases, therapy/counselling/standard "fix your brain" drugs won't work. Proper rehabilitation (being taken away from the cause/trigger) might have more success, or it still might not.
In some cases, people either can't be fixed, or can't be fixed yet. Which is not to say that they shouldn't try, mind you.