Harmless in intent, is nothing like harmless in a physical sense. Harmless in intent is more or less saying that with their intentions that didn't mean or cause any harm. Now if you really want to twist it around, you can say that when they are attacked, then they will cause harm, but any body would defend themselves. As far as the BoS moving around and coming to DC, I do not find it so hard to believe. Why would they not go in search of bigger better weapons? Isn't that what they really want? There could be a large number of stock piled weapons, hidden behind some heavy locked vault door, that the government built. Then again they might just find designs for some amazing weapons. I don't see that as being altruistic. Then add into the fact that going from California to D.C. is a huge trip. There is no telling what they saw out there in the wastes. They might have learned the true horrors of the war, and saw how people were truly affected. Other than people who are psychotic, almost everyone can feel sorry for people who are suffering greatly. This could have changed that one groups out look, and perhaps changed the rest of BoS. No one really knows how bad the Central part of the United States is. Do we really know if the BoS is altruistic now? I mean the game really isn't out yet, and all we have as far as the plot goes is our dad is a doctor that ran away, and the few quests show in videos.