Since asking the Cannibal orc question, I have acquired a couple books on tolkien's world (don't you just love barnes and noble?)
In Guide to Tolkien's World: a bestiary
(David Day, copyrighted '79) it says of orcs:
They were cannibals, ruthless and terrible, and often their rending claws and slavering fangs were gored with the bitter flesh and the foul black blood of their own kind.
And in the Tolkien Companion
(J.E.A. Tyler, copyrighted '86) it says:
the creatures [Morgoth] made were evil, filled with his dark will, cannibalistic and cruel, and they abhorred the light of the Sun from their Beginnings...
How does this fit in with the fight over Merry and Pippin? Was Tolkien indecisive, or was it wrong for someone besides an orc to kill orcs to give it to other orcs?