Actually, it's for history. Was your great grandfather embalmed? Put in a fancy box? Buried with lots of other dead people under a big, fancy grave marker? Then he is, or will be, a legitimate subject for history. Especially when the culture which buried him disappears and their rites become essentially meaningless. If you're so concerned about archaeologists digging you up thousands of years after everyone has forgotten you, then make sure there's nothing left for them to dig up.
Descendent Of Stone Age Skeleton Found (Cheddar Man - 9,000 years Old)
Mr Targett has not moved more than two miles from is ancestorial homeland of 9,000 years. (And, my ex-wife complained I didn't like to go anywhere.)