Just because the ones who took over the Native lands through genocide and trickery, lost and forgot who they are and what made up their cultures, they automatically think Natives should forget about Native cultures also. In another sense, the colonial sense of entitlement with the  capitalism, is the reason America is mired down in foreign occupations and the neverending war on terrorism against foreigners who would have no reasons to attack America, except we invade so foreign corporations can reap profit off our trillions, lives of our kids and cannibalized programs and infrastructure