I just want to add my two cents into this debate with this article by Fr. John A. Hardon, S.J. in defense of Christopher Columbus.
In Defense of Christopher Columbus the Catholic
I will end this with a couple of quotes from the above article. Please read Fr. Hardon's article as it reveals the seldomly heard truth about Columbus.
Those who criticize Columbus for destroying, in their words, the precious culture of the American Indians, ignore the grim facts of pre-Columbian American history.
A fair example is the Aztec civilization in Mexico. Seemingly advanced in other ways, the Aztec religion sank to some of the worst excesses of superstition. It is so extreme as to be almost incomprehensible to us who are familiar with the barbarous atrocities of the concentration camp and nuclear war.