I don't think all psychopaths are predators, exactly. I think some don't bother. It's not their thing. But what I think is that all of them do not see people as people. I think that when they look at another person, they don't see Judy or Sam or Joe or whomever- they see some construct in their own (the psychopath's) mind. And that construct is quite one dimensional. So they don't see people as they really are and they lack empathy. People do not matter, they're almost like things to a psychopath.
SPs supposedly are like that, according to Scn theory. However, one of the areas where Scn theory differs from psychopathology's theories on the subject is how they got that way. An "SP" is supposed to be stuck in a "mad howling moment" of yesteryear. And that's what made them that way. Now, I have run into that concept elsewhere than in Scn ("Dexter"!!) but it, by no means, is a constant or a tenet held by the mental health profession as to the real reason. A doctor would tell you that some people have a chemical imbalance. Others got a blow to the head that changed their brain patterns. Others- no one knows why. And others will debate nature vs nurture. But a Scientologist will tell you that it's always the person being stuck in a mad howling moment of yesteryear.
Another thing I've noticed is that Scientologists imbue an almost magical mystique to "SP"s. I remember talking to someone about the movie A Few Good Men. The friend was attributing an almost demonic and powerful m.o. and way of being to the Jack Nicholson character. That's not the only time I noticed such an attitude.