I think concurrent with that thought (re: Troi's empathy), there's also the issue of just how, precisely Data and Lore's 'emotions' work, precisely... Many times, it's been established that Data's positronic brain is capable of experiencing many things that the human brain cannot (multitasking, extremely fast and precise calculation and thought, fully compartmentalized thought processes, etc.). From that, one can't help but wonder just how an human emotional matrix would deal with such a mind, as, in theory, it would seem that Data could occupy several mutually exclusive emotional states simultaneously, instead of bogging down his entire matrix with one all-emcompassing emotion (which was seen to be utterly crippling for him on many occasions after aquiring the emotion chip). In any case, given Data's processing speed, one would think that he could work through emotional issues and traumas with ridiculous, almost psychotic ease. Imagine what that kid of whiplashing emotion would feel like to someone like Troi, assuming she can, in fact, sense his mind...