Depends on the campaign tone. I'd like the game to support "Knee deep in dead orcs? Is that all? Send more orcs!" and "Oh, woe betide the sorry fate that causes us to kill, lest we be killed! Curse you, cruel gods of dire necessity!"
Hell, I like it when both characters are in the same party.
Here's a tip learned from almost three decades of DMing. (I'll hit that '30 years of running people through dungeons' mark in October or so):Ethical dilemmas get your players arguing with each other, in character, chewing up game time in a way which requires very little prep on your part. THEY remember this great, involving, game; YOU remember having an extra half hour to nap instead of statting out opponents. Someday, I'll write 'The Total Lazy Bastard's Guide To Being A Great DM, or, How To Plot A Five Hour Session On A Twenty Minute Bus Ride')