The last time a US Government tried active assimilation policies, it led to actual acute starvation conditions at Menominee and Turtle Mountain, two of the three large communities chosen as a pilot project (Klamath was a qualified success, actually, and the numerous tiny communities pressganged into the project were much more assimilated into mainstream America before, and thus suffered far less). And that was in the 1950s. "Stockholm Syndrome" indeed.
I don't think they ought to try active assimilation policies. I believe that the Bureau of Indian Affairs should be scrapped and the tribes left free to govern themselves without the intrusion of the federal government.
Right, which would solve reservation poverty how?
Some BIA intrusions certainly deserve to go. I'd love to see citizenship reformed to where it would be possible to have variable blood quantum requirements depending on whether somebody actually lives at or near the community or not, for instance.
I find it hard to believe we're in the 21st century and people are still being classified by blood quantum at all.