I hadnt played for about a week when I loaded up last nite and Sanctuary was like Tombstone, people were shooting everywhere :P I was getting upset cause I just wanted to build a bit but I had to keep running around thinking it was raiders, so I shot any named npc's causing probs (hope that wont cause me any probs down the road).
The Scavenger is always involved. The Tanner, Mr Gutsy (the human one), Jonah Hex and Robert Ross are the ones who got 'judged' last nite. The girl in the red sequin dress always fights with Ada, not sure who instigates. Ill go back and check ID's on corpses for more info.
Btw am I the only one that gets creeped out by the robot voice coming from the human Mr Gutsy?
EDIT- I reloaded a save just before the massacre at sanctuary and it may have just been the Tanner who caused all the problems. One thing was interesting, Tanner attacks Robert Ross and then a guard dog aggros on Ross rather than tanner, Jonah maybe just got caught up in crossfire but I didnt see him in the reloads. Mr Gutsy and the girl in the red dress were aggroing Ada but gutsy hasnt reappeared after being shot.
TLDR- The Tanner and Scavenger are the only ones I can definately point to, but Mr Gutsy and the girl in the red sequin dress aggro on Ada.