Sadly, many if not most immigrant-based Americans will not only continue to deny the reality of the making of the US, they will conclude that anyone who disagrees is absurd and believes in the myth of the noble savage, etc., etc.  I don't believe that humans can fix this. In fact, I believe that the destruction of indigenous people was just more of the destruction they inflicted on each other and the weak and the poor in their own societies for several centuries.  

"The Care and Labour of providing for Artificial and Fashionable Wants, the sight of so many rich wallowing in Superfluous plenty, whereby so many are kept poor and distressed for Want, the Insolence of Office . . . and restraints of Custom, all contrive to disgust [the Indians] with what we call civil Society."

— Benjamin Franklin, marginalia in a pamphlet entitled [Matthew Wheelock], Reflections, Moral and Political on Great Britain and Her Colonies, 1770