Oni
First Post
As far as correcting behaviour: the characters will curb their characters own behaviours if they think it will have a detrimental in-game effect. If we show brutality and disrespect to our enemies, our other enemies become more determined to avenge their fallen comrades, striking harder, fighting longer, focusing on us instead of being distracted and easily caught by surprise. Or the tribes skilled trackers use scent to follow them back to the village and slaughter many innocents to leave a message for the pc's. I don't mean 'oh you've been a bad boy, now you will feel the wrath of the almighty DM'. It has a certain logic that if the pc's use these tactics to try and intimidate the rest of the 'evil' gang, and all they achieve is making their task more difficult and dangerous, inadvertantly damaging the same 'innocents' they claim to protect, they are unlikely to use these tactics next time. After one painful/uncomfortable consequence, they will probably think twice about whether it's really worth their while throwing a mutilated hostage through a window.
If we're being really fair about this, isn't equally likely that their actions could have the intended consequences and intimidate their foes causing them to panic and be less effectual, or even entirely break their will. Isn't it also entirely possible that actions motivated but good could have bad consequences, like say the villians life you spared comes back and slits your throat in your sleep because your stupid? Consequences don't care about morality, and evil action might have a positive outcome or a negative outcome but sadly being a bastard isn't always going to make one's life harder.