The more intense the conflict thus becomes, doesn't make that the game much more fun?
If you're roleplaying your character as a villain, maybe you don't mind another person roleplays him that way. If you like to show him as somebody with noble manners rather than a sanguinary with no morality, maybe you do mind.
Personally I think roleplay should help to add flavour and fun to the game, not to create exaltation attributing murderous attitudes to the characters when there's a war involved. Of course in the real word there have happened (and keep on happening) awful barbarities in war times. But if we want to play our characters as if they were gentlemen, we should avoid that kind of talking.
In my opinion, that's another thing that should make a difference between BattleMaster players from shabby players that use distasteful language in other several RPGs.
