Here is a thread debating whether Orcs were immortal or corrupted Elves.
http://forum.barrowdowns.com/showthr...ht=nature+orcs
And here is a thread addressing whether Orcs are inherently or irredeemably evil.
http://forum.barrowdowns.com/showthr...ht=nature+orcs
I provide these links to encourage discussion and provide ideas and insight, not to discourage further discussion.
I find the question of whether Orcs view themselves as evil to be intriguing. I would guess that Orcs are simply what their corruptted nature made them. Clearly, they enjoy cruelty; it is what they are.