I always like to provide a Motive behind each guy my Character Kills.Is it for money,Fame did said person betray him Etc.
Motives are good, typically my motives of killing neutral NPC`s is always "resources". They are killed so I can loot their stuff for caps and if lucky get a key to their business to loot their business inventory. Not that I need to since I have three mods currently installed (one for lights throughout the wasteland, one for a underground personal vault in minefield, and one for a tranquility lane house with a huge underground vault like base) has alot of resources there. But I plan to follow through ever play through I do starts out evil then quickly turns into a good person then. Not to get too far off topic I guess it has to do with the fact that the main quest is only completed through mostly good actions, even the modified FEV virus shouldnt be used cause it will effect you as well since you werent born in the vault.
There are some motives that are done just because I hate the person. For instance tammy, that drunk on rivet city absolutely pisses me off with her attitude. So I slit her throat at night while her son slept 3 feet away, now everytime I ask him what happened to his family he tells me that "some [censored] like you killed them". Too bad I can kill him as well I would in a heart beat.