I'd say say that homo sap is on the list of worse behaved apes than Gorillas. Chimpanzees and Gibbons will tear off your face, but it is a big mistake to suppose animals are in a lower ethical state than humans, as animals don't

* have 20 cops beat up one suspect * deal crack * attack people with assault rifles out of hate * invent poison gas * find demeaning labels for one another, etc.

Look at animal behavior and it seems that animals are basically rational in that they do things in the social space that raise their utility function. This is not so clear in the case of humans (an herbivore will always express satisfaction if you feed it, a human might not.)