It's probably both. Environmental effects can change brain structure, so they need to be able to rule that out.
Pedophiles have lower IQs, are three times more likely to be left-handed, and even tend to be physically shorter than non-pedophiles.
Caveat: The subset of pedophiles that get caught have these tendencies.
Journalists do get carried away.
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Exactly.
They tested 127 people. 1/2 of them were pedophiles. So that means they tested 63 pedophiles. On the basis of this very small test group they can't reach any of their conclusions. Perhaps it is only ugly, left handed, short pedophiles that got caught in the first place... Or they were the most bored in jail and were the only ones who volunteered for this study.
Dr. Joseph Nicolosi and NARTH have researched this for years. Fact is, there are specific things that usually occur to trigger such disorders, and they usually take place before the age of 12, during the sexual latency period.
The APA is determined to find other answers, though.