Exactly that.
Some people do not want sites that have to do with their heritage to be disturbed even if they're thousands of years old. Religion, culture, past exploitation, etc, may be factors in this.
Some sites may be a mere couple of centuries old. Roanoke Va, for example, or Richard III.
Richard III was accidental, and like Roanoke has much to do with solving a mystery. Plus proper measures are taken to respect the remains in a culturally fitting way,,,