This could contain spoilers but im sure the people who read the forums have completed the game.

So i did the Blood Ties Mission the 'Nice' way. Arefu were suppose to give the Vamps blood in exchange for protection. I went to the station to sell Vance some blood bags but his lacky started shooting me at the door, i killed him carried on and they all started attacking me. I re-loaded thought 'screw it, i dont really need to go there anymore anyway' Went to Arefu to get the Bobblehead and King started attacking me. Needless to say i killed him because i needed the bobblehead.

So im just curious i didnt do anything, didnt steal or murder. So why did both 'factions' start attacking me? I looked it up on the Wiki but that didnt explain anything just wondered if anyone else knew anything or if it happened to them.