Originally Posted by
No brains
Certain creatures can damage creatures by falling on them with their Crush (Ex) attack, which dragons actually have at a certain size. The dysfunction here could be that a dead dragon doesn't deal damage when falling on someone because it can't take a standard action.
As for creatures and their corpses as objects, the best RAI I can derive is that creatures possess their body parts as objects. When a creature dies, it becomes much easier to remove those objects from the creature. The creature no longer has control or possession of the objects that make it up and they can then be used in different ways.