If I go and dig up a tomb from Egypt that is 3000 years old, it's archaeology. If I go and dig up the grave of someone buried 5 years ago it's grave robbing. FWIW, I agree with most things belonging in museums, and get especially annoyed at a lot of the silliness of indigenous people who consider everything so 'sacred' that no research, exploration or development can be done.
The indigenous Americans aren’t fighting their places being dug up because they think they are sacred. They don’t want archaeologists discovering that the earliest North American settlements were Caucasian. That wrecks their “Our land was stolen” argument since they stole it from earlier settlers. Apparently there’s evidence that the Asians came over the land bridge from Asia after North America had already been occupied.