This assumes the genocide has ended, which it very much has not. In what year did Native American parents receive the right to choose not to send their kids to a boarding school?

1978.

Until 1978, Native American families were being separated against their will.

To say that no one currently alive screwed then over is absurd. This month, the President made motions to try and remove birthright citizenship for indigenous people.

No, there are absolutely people still alive who screwed them over.