[shadowfyr]

Yeah. Its a cycle. I once heard someone that was not that far gone (they would have never had thoughts of those three things, but where into a range of things that are fringe). They described it like this - If you have problems having normal relationships, then you start imagining abnormal ones. Once you are finally able to have a normal one, for most people, the stranger and less accepted fantasies get replaced with normal ones. Now, obviously for some people, who have impulse control issues, or other problems, this can escalate out of control, but no more so than any other such behavior, nor in stable people. Just as some people can hunt all their lives and never go wacko, but some people start with pulling legs off insects, escalate to killing the neighbors cat, and *eventually* end up killing people. Its only a fraction of the populace that does that, and usually there are either issues of abuse in their childhood background, or literal physical defects in their brain, which result in them mis-processing the behavior in the first place. You don't generally hear of someone with a normal childhood, unless they later suffer certain types of head injuries, one day deciding that they like the sound people make when being killed, and starting a murder spree, for example.

While you are correct in how things tend to escalate, its more complex than that, and not any where close to as black and white.

Oh, and just to be clear, the one reason that I don't think Beastiality "fits" in the category you put them in is that, quite frankly, there are quite a lot of people that engage in it, and the number of people that get caught humping the neighbors poodle isn't that huge. Most engage in the behavior in closed environments, with their own animals, etc. One might compare them with people that go to S&M clubs, more than with the other types of behaviors. And yeah, I know that some people consider S&M anti-social too, but that's beside the point.