de Waal's latest book claims that empathy came from the primate world? Chimpanzees can behave with empathy. So can bonobos and other great apes. I've read Hodobler and Wilson's work on eusociality. I think it is true that we are eusocial and the other great apes aren't. I suppose I didn't list it because eusociality is a function of having complex language and the desire to teach and by taught etc. But point taken. I've never heard of Chomskey's LAD.
It is a complex eusociality and teach/taught are part of the same thing.(in my mind) on empathy I think the word requires a split cognitive empathy (the ability to figure out what the other guy is thinking/feeling) and emotional empathy (giving a shit about what the other guy things and feels). if one lacks cognitive empathy he is a aspie. lacking emotional empathy is sociopathy. The chimps I met have a bit of the first one and none of the second.