I have to categorically reject this. I am Autistic and I do not feel emotional empathy for the most part. I am still a compassionate, caring person who tries my best to care for others. This is true of many others who lack empathy. I reject the idea that there is a class of people called "narcissists" who are broken to their core and innately abusive. I do not doubt that the experiences you endured were horrible and inexcusable. I have been in abusive relationships with people that others would happily put the narc label on. But I find the entire process of attributing someone's abusiveness to mental illness to be a deeply ableist line of thinking, and a dangerous one. I don't blame you for harboring it, it's very common and many abuse survivors are encouraged to develop that belief. But I think those who have absorbed that message have been mislead.