Fascinating quote:
In 1833 he made the acquaintance of General Juan Manual de Rosas, who was busy liquidating the Indian population of southern Argentina. “This war of extermination,” Darwin wrote in a cheerful letter home, “although carried on with the most shocking barbarity, will certainly produce great benefits; it will at once throw open four or 500 miles in length of fine country for the produce of cattle.” The “extermination” (a favorite word of Darwin in his writings) of failed races, whether animal or human, is a great theme in his books and a key feature in the advance of the evolutionary process as he conceived it.
Whoa!
Surprise, surprise...Charles Darwin was also a social Darwinist!