The schools should have been located on the reserves, so the students would go home to their parents each night.  It was feasible even at that time, as was shown by the one-room schoolhouses that dotted the rural prairies.  Doing so would have prevented nearly all the sexual abuse by the predators who were attracted to the schools.

However, today's social justice warriors would still level accusations of "cultural genocide" because the students would have been taught English, math etc.