Obviously, you need to do more research. 
Whites were starting the wars. 
Whites took native children from their parents and put them in boarding schools to turn "heathens" into Christian's. They killed the parents who tried to protect their young.
They moved tribes off land that they wanted, and killed ones who wouldn't go. 
They brought their diseases in, too. And killed more. But the eradication of Natives was not all by disease. 
Is It any wonder there's still ones who hate whites? 
Native Americans were treated as bad, if not worse, than slaves.