None of these theories is proven, of course. All of it, provisionally. Science is best served by open minds. In fact, it's well on its way to becoming what scientists call the prevailing paradigm. And with that shift should also come a concomitant shift in the government's policies for dealing with human remains that, for reasons of great age or racial characteristics, cannot be affiliated with modern Indians.
Government policy needs to catch up with science.
Congress is willing to correct a profound flaw in the 1990 law that permits repatriation of unaffiliated remains to modern tribes. Regrettably, that bill languishes in Congress. The 1990 law was passed before evidence of earlier human presence on the continent had come fully to the fore. So it's a safe bet that most members of Congress who supported the act didn't understand that they were voting to bar access to knowledge of America's prehistory. Any responsible lawmaker should welcome the opportunity to correct such a profound error.