I've been reading Pinker's "Better Angels of Our Nature" and it seems to me that people don't need to be psychopaths to have difficulty feeling empathy and concern for other people. If you've read HPMOR, the villagers that used to enjoy cat burning are a good example, which Pinker uses. He suggests that our feelings of empathy have increased over time, although he's not sure for what reason. So earlier, a couple of people in their better moments might have claimed caring about others was important, but generally people were more selfish, so that the two did become out of sync.
I mean, even today when you say you care about other people, you don't suddenly donate all of the money that isn't keeping you alive to effective charities, because of the empathy you don't feel with every single other person on this earth. You don't have to be a psychopath for that happen.
This reminds me of this part from "The Failures of Eld Science":
..."A woman of wisdom," Brennan said, "once told me that it is wisest to regard our past selves as fools beyond redemption—to see the people we once were as idiots entire. I do not necessarily say this myself; but it is what she said to me, and there is more than a grain of truth in it. As long as we are making excuses for the past, trying to make it look better, respecting it, we cannot make a clean break. It occurs to me that the rule may be no different for human
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