Native Americans are the only group of people who can call the FBI and say that some ancient artifact collection is “theirs”. They will dispatch a 100 FBI agents from their “Art Crime Unit”, and take it away. Let some Norwegian like me, lay claim to my Viking ancestors weaponry in someones private collection, and everyone would rightfully laugh. But no, American Indians are taken seriously when someone has some Indian arrowheads or pottery.
Most collectors do not disturb burial grounds. Most finds are arrowheads, scrapers, or other tools. A good percentage of arrowhead finds are ones that were lost. If you see a lot of chippings you might find some tools especially if you located a camp. Burial grounds are away from camps and usually have distinct characteristics.
OK that said who has disturbed the most burial grounds? Government in the form of state universities, Federal Utilities flooding massive acres of land where burial grounds are located? Or the typical just for the sake of hunting arrowheads etc. collector? The Federal Government damaged or flooded more burial grounds in three decades than even the most unethical collector doing a dig. The latest such flooding is called Tellico Lake.
The best points I have seen that people found {I do not collect} have been from private farms where the farmer plows up a river bottom or field along a stream. Again these are not burial grounds. These were camps.