The surviving native Americans have not forgotten what happened. There was also mass fetish in Germany during the 1970s and 1980s for all things native American. Genocide never had the same degree of stigma that it has now prior to post WW2 condemnation of the Holocaust. The Bible praises some genocides as being good and God's will and condemns other genocides as being bad and not God's will. I hope the stigma against genocide lasts forever but there is no reason to believe that the stigma against genocide will stay in place. Clearly on average history is inaccurate and is biased in favor of the victors.