I just finished New Vegas, siding with the NCR. This was my fourth run-through. This time around, I blew up Vault 19. (It seems that being "Very Good" karmically involved a lot of blowing up established environments -- Vault 19, the Brotherhood, I could go on ... )
So I get to the end-game, and I'm told that the Vault 19 Powder Gangers continued to torment the wasteland for years, preying on citizens of the NCR.
What? I blew them up. Like, exploded the Vault. Kablooey! Is this a glitch, or does the game just not have a separate ending slide for, "the Courier destroyed all the evil ex-cons and the NCR lived happily ever after?"