Neanderthals were probably just as racially tolerant as cats. As Horkeimer and Adorno have pointed out time and again, the issue or concern can be summarised as such or it may be said this way; that we are so intelligent that we have become, in many ways, defiantly unnatural. See Ecclesiastes 7:29. http://www.sup.org/book.cgi?id=1103 The Dialectic of Enlightenment is undoubtedly the most influential publication of the Frankfurt School of Critical Theory. Written during the Second World War and circulated privately, it appeared in a printed edition in Amsterdam in 1947. "What we had set out to do," the authors write in the Preface, "was nothing less than to explain why humanity, instead of entering a truly human state, is sinking into a new kind of barbarism."