Final Attack said:
...I think my PCs are killing without fear of consequences, and still putting on the facsade that they are a GOOD party (namely because their class requires it).
I think you're wrong about this. The PCs didn't kill without fear of consequences. The PCs could have died from fighting the NPCs! In D&D, appearances are deceiving. Every battle with NPCs is a
huge risk. The PCs weighed that risk and rolled the dice.
If you want to punish the PCs for daring to have pride and self-respect, the next time the PCs attack an annoying NPC, have the NPC kill the whole party. DMs can do that, you know.
Final Attack said:
I want them to either drop the facsade or repent, but I'm having trouble thinking of how to do it in my situation.
You are having a problem because there is no facade to drop and nothing to repent for.
The PCs are heroes because, for the most part, they do heroic stuff that benefits civilization, like killing monsters and saving towns, etc. If some NPC moron gives them a hard time and the PCs kill them, so be it. Heroes aren't all sunshine and rainbows, and that includes paladins.
IMHO, a DM should never oblige his players to roleplay their PCs as wimps, as some posters are suggesting. PCs being afraid of the cops is wimpy and too 21st century. In real life, you are obliged to tolerate morons so you don't get sued for knocking their teeth out and tossing them into the path of a bus. But D&D isn't real life. In D&D, if an NPC so much as mumbles, "You stink" to a PC, the PC is well within his rights to teach the idiot a lesson. That's what makes D&D fun!
All that a good-aligned PC should do before slaughtering a mouthy NPC is say, "Watch yer mouth." Once. And even the warning is optional. A narrow-eyed glare is sufficient.
If, once warned, the NPC quickly collapses to his knees and begs forgiveness and offers to buy the PC's party a round of beers, then all will probably be forgiven. But if the NPC actually has the AUDACITY to stand his ground, he brings his own doom upon himself.
I think the real question you should be asking yourself is this: Why am I trying to humiliate the PCs over and over? And when the PCs get annoyed by my annoying NPCs, why am I too proud to have my NPCs crap in their pants in terror and beg forgiveness?
In a nutshell, PCs should never have to tolerate annoying NPCs, with the possible exception of old, wrinkly, unarmed female NPC, and even
that depends on how annoying she is.