Henry
Autoexreginated
Fourecks said:...The body convulses. The eyes go dim. You've just killed someone in cold blood.
...And you say you can't see a reason why this is evil?
And you think man-to-man combat is any cleaner?

TV and movies have sugar-coated the fact that ANY killing is a messy and soul-altering business. Even if a person is forced to kill in self-defense, most police and soldiers tell you that it is a life-altering event. The old traditional saying goes that, if it gets emotionally easy to kill, it's time to get out and seek professional help.
On the other hand, I do have to re-iterate for Arcady that it is self-defense we are talking about here. The cliche for adventurers that go and loot the orcs' cave home for fun and profit does not apply to all games everywhere. In most of my game scenarios, I set it up so that it is the PC's who are being invaded, not the invaders. Orcs poison the town water supply so that they can take the human's land; Ogres are bullying cravans on toll roads. Trolls are exiting the swamps because they covet the goods in the human cities. In the world, they are the agressed, not the agressors.
I could run a morally ambiguous game, but I choose not to, because I play D&D for the same reason I watch Jet Li films: escapism, and having fun with friends.