Your url didn't lead anywhere but it might be something weird with my computer. I'll have my husband check it for me when he wakes up.
I may not be explaining it right (I'm just a high school graduate, not an expert in anything except maybe dog training). What I'm trying to say is that, based solely on my own life experience, taking meth doesn't turn someone into a pedophile if they didn't already have that particular inclination. It also makes people a lot more likely to go "hey, why not" to ideas that are really, really stupid (like carsurfing).
It seems to me that meth intensifies the user's behaviour but it doesn't make them do anything that they would normally find completely unthinkable. If they normally had a good relationship with their mother, for instance, meth won't make a person break into the mother's house at night to kill her. It might make someone who was angry with their mother do so, though.
Of course, this could all be biased from being based on my small sample population, which is made up of people I know who got caught by meth.