Indians were wild animals who roamed all over North America for thousands of years. Where they found food, they camped until the food ran out and then they moved to a new camp leaving behind artifacts every time they moved. When bands bumped together in their travels, they killed each other wholesale and left even more artifacts. They did this for millennia, falling where they died, decomposing on the spot or being preserved to some extent in a bog or mudhole. They did this in their countless hundreds of thousands, maybe millions over all that time.
If development is prohibited at every site that at one point in time hosted an Indian camp, or was the site where an Indian or group of Indians died, then there's no room left for modern man. As per the OP, the value of what can be learned from the relics of their "society" is no more or less than the satisfaction of idle curiosity. It certainly isn't worth damaging the quality of our lives in today's world.