You may be mistaken. I've heard that the dirt on Columbus was written by his lifelong archenemy and that there is no other source for his purported "atrocities" than one account written by a guy who had hated him his entire life. Meanwhile, there are several other accounts, basically showing Columbus to have been a pretty good guy by the standards of his time. Admittedly, one of those accounts is Columbus' own diary, but there are others.