First of all sorry if I'm offtopicing too much but it might be useful to some readers to have this clarified.
Spot on. Just like the cognitive empathy of autistic people. They can empathise cognitively but can't express real felt empathy not because they lack the feeling.
Well my point was quite the opposite. pwASD
lack cognitive empathy and often the ability to read facial expressions [of other peoples emotions] correctly; check google scholar if you are interested in this.
The second thing, "real felt empathy" is a bit of an emotional warble which reminds me of what the people in my little story probably would say. To my experience they can be good at being contaminated by what they think are other peoples emotions but often can't act on what really goes on in the other person. So quite frankly I totally opposed to the idea of emotional contagion being "real empathy" - I think lots of people on this forum have this idea because they have never experienced empathy or someone really listening to them in their lifes, but - to use a word here I learned from Quoth which I really liek - "emotional empathy" in many cases is just a part of emotional reasoning, and can in many cases be a precurser to abuse.
You can learn more about this by referring to Sam Vaknin.
Like Absinthe noted, Vaknin is basically a nothing in regards to NPD, he has never treated or researched NPD, holds no relevant degrees and also does not have NPD himself, nor was he ever in any long-term therapeutic treatment. He is in fact a diagnosed psychopath, an ex(?)-con and his writings, as broadly available as they are, are fault-ridden summaries of other peoples works intertwined with this own baseless theories about an illness he barely understands.
If you are looking for an introduction, Elsa Ronningstams work is still a good and relatively accessible starting-point.