Well, people who, without one single trace of evidence, state as fact that indians committed genocide against earlier caucasian inhabitants, for example.
The bottomline is, look through ANY American Indian related thread on this board, and you will see the hatred. Just open your eyes.
The nefarious purposes? Why, they would like to do away with every treaty, agreement, and everything else. Ya know, renege on legally, constitutionally binding agreements because they are just "race-based entitlements" etc...
But political interference with the scientific investigation of the evidence doesn't pass the smell test. Maybe there are some nefarious motives on both sides of the issue. I don't see all the Indian threads but I don't recall anyone suggesting the abrogation of treaties and agreements.