I agree with you that there are instances where Europeans wiped out natives and even where that was the mindset. The fact remains that the majority of Native Americans did not die due to systematic extermination. It is indisputable.
The US had done bad things, but every single culture in the world has done evil things. That is human nature. Many native tribes engaged in torture and regular warfare of their own. The only thing we can do is learn from it and the only way to do it is being objective about history, not engaging in exaggeration.
Can you get more genocidal than that? Can you find a Hitler quote, from before the start of WWII that comes close to that?
Mein Kampf?
Hopefully when Trump does not become Hitler 2.0 you will admit you were wrong.