I'm not contending that they exterminated the buffalo although it is interesting who preserved them. What I am saying is that they treated the buffalo as an inexhaustible resource that could never end and often wasted a great deal themselves. That has been well documented by historical sources whether you choose to believe the modern romantic revisionist notions or not. 

People are good and bad in every society and anybody that thinks one civilization is or was better than another is practicing racism by any definition.