I don't expect you to know this, but individual tribes were only rarely known by their tribal name. In general they were referred to as "the savages".

We as a rule don't get our knowledge of tribe names from the soldiers that killed them. They are known because they also had white friends that made note of them. They were known to their murderers as "the savages". We know their tribal names from OTHER more peaceful sources.

If genocide was not the intention; it never had to happen. They posed VERY little threat. Just because a genocide is not 100% successful does not mean an attempt at genocide did not occur.