Orcs were created originally by Morgoth capturing and torturing elves in some way to change their nature permanently to evil, and their appearance to be horrible. Do elves know that? When fighing orcs, do elves ever have any ambiguity of feeling, since orcs might be related to them?
At the end of LOTR when Sauron is defeated, is he really completely eliminated from existence? Is there any remnant of soul remaining that would wander back to the Halls of Mandos? Does he join Morgoth on the other side of the Door of Night? He poured a lot of his power into the ring, but not all of it, so I wonder if destroying the ring really destroyed him or only made him small, and insignificant to future events.