Back in 2nd ed. I had a barbarian who ritually cannibalized the dead, but only if they were worthy. He fully expected the enemy to do the same with his body in turn. For him it was a sign of respect.
Bodies not properly buried in my game had a tendency to come back and bite the PCs in the arse. By properly I mean burial rites. Destroying the body does not in any way prevent ghosts, wraiths, or other incorporeal horrors. One party kept wondering where all the disembodied nasties were coming from...
The Auld Grump