Jane Goodall showed about about our close relatives in the primates are vicious. "During the first ten years of the study I had believed […] that the Gombe chimpanzees were, for the most part, rather nicer than human beings. […] Then suddenly we found that chimpanzees could be brutal—that they, like us, had a darker side to their nature." Goodall also observed the tendency for aggression and violence within chimpanzee troops. Goodall observed dominant females deliberately killing the young of other females in the troop to maintain their dominance, sometimes going as far as cannibalism. And this is in us. [People are evil.] The difference Dr Huemer wrote that we can use reason to see objective morality.

And this certainly goes along with Hegel. However Huemer is coming more from the direction of GE Moore.

But to Leonard Nelson we know good from evil by a third sense--non intuitive immediate knowledge. And I am not at all able to see who among these greats was more correct. But one thing all agree with, we can know the difference between right and wrong--if we try hard enough. But without that effort we are naturally evil.  [See In Praise of Folly by Erasmus, and or Candide.]