It's interesting that you bring this up, because just the other day a man I know told me that he is not only an INTP, but also a sociopath. Yes, this came up in casual conversation as if we were discussing the weather. I got to thinking about the functions and the Ti-dom definitely made sense to me as many functioning sociopaths are very intelligent and seemingly introverted as they hide themselves from the world in a masked fashion. At first though, I couldn't understand Fe being a function for him at all since he doesn't relate to the feelings of others, but then I juxtaposed that with Fi and it makes total sense because Fi is all about morals and what is right and wrong to an individual. Sociopaths naturally lack a moral compass, so Fi wouldn't even be a thing for them. But Fe on the other hand, even if it is learned would be necessary for a functioning sociopath and is something that they use regularly, albeit in a manipulative and weak fashion, but it is there. I haven't given much thought to Ni vs Ne, but I would have figured Se to be of more importance to a sociopath because of it's likelihood vs Si to seek out thrilling experiences so that throws me off a bit, but it makes sense that he would be perceiving over judging as he likes to live for the moment by his own admission.
Side note: Given my understanding of and fascination with sociopathy, I wasn't frightened in the slightest by him admitting this to me. Rather, it just piqued my curiosities. I'm looking forward to speaking with him more as I think it's a rare opportunity, and I'm in no danger given the situation and the fact that I am not naive to the charm and manipulative nature of such folks.
