Sociopaths do feel, they just don't show signs of remorse. Sociopathy is equivalent to AsPD which concerns destructive behaviour rather than a mind with shallow affect. What you really mean is 'are INTPs PSYCHOPATHS?'. Although I have found a few psychopathic people to have an INTP personality type, the majority are ENTP. This would make sense as the Aggressive Narcissism traits on Hare's Psychopathy Checklist include Glibness/Superficial Charm and Cunning/Manipulative which are supposed to be very Extroverted traits. You seem to think that a psychopath must have Fe as its Quaternary Inferior Function, which is a misconception. A successful psychopath uses Fe regularly in order to blend into society and such use of selective Fe (the use for ulterior purposes without holding the tool in intrinsic value unlike xxFJs) would suggest the function being tertiary as it is a function developed over time and is not the person's natural way of viewing things. Indeed, I have found most psychopaths I have tested to be ENTP and indeed many ENTPs not possessing the disorder have managed to identify with far more of the traits on the checklist than other types.