Andrzej Sapkowski said this quote
“ I predict a bad end for your race, humans,' Zoltan Chivay said grimly. 'Every sentient creature on this earth, when it falls into want , poverty and misfortune, usually cleaves to his own. Because it's easier to survive the bad times in a group, helping one another. But you humans, you just wait for a chance to make money from other people's mishaps. When there's hunger you don't want want to share out your food, you just devour the weakest ones. The practice works among wolves, since it lets the healthiest and strongest individuals survive. But among sentient races selection of that kind usually allows the biggest bastards to survive and dominate the rest. ”