WayOfTheFourElements
Hero
I once had a player whose character ate his fallen enemies in order to steal their power ("You are what you eat") in order to to kill more evil creatures. That was CE played well, in my opinion.I have run in a previous edition, with a Book of Vile Darkness in play, but also a Book of Exalted Deeds. One without the other seems ... unbalanced--not mechanically, more aesthetically/philosophically.
I will grant, though, that the corpse is no longer intelligent (barring magic or other wierdness). OTOH, killing sentient beings to eat them is distinctly monstrous.
The standard of care here depends on too many things for there to be one definitive answer for everyone, I suspect.