Aye, there's the rub...

It is a common saying that dog eats dog. The man who said it first did not know dogs. Dogs do not eat dogs. They work in packs and a pack animal is not a cannibal. It depends upon its fellows to bring down its prey and being dependent has the morality of a social being, an instinctive morality but morality for all that. Man, on the other hand, has not natural or instinctive morality. The process of history proves to the contrary and the history of religion reinforces it. If there were any natural morality in man there would be no need for religion or indeed for law. And yet without morality man would not have survived. Another conundrum, gentlemen; science destroyed the belief in God upon which morality depended for its source; science has likewise substituted the means for man's destruction; in short we are without that moral sense that has saved us from extinction in the past and in possession of the means of extinguishing ourselves in the future. A bleak future, gentlemen…

From Tom Sharpe's 'The Throwback'. Black humour… at its blackest!