Uh. Yeah. If you murdered someone after identifying yourself and then going to their house someone is going to find out, and likely attack you. You probably just turned everyone in the town hostile to put it in game terms.
My best guess was he just mass-murdered everyone in the dining hall. Or the ticking egg did. The egg seems like a reference to something, but I'm drawing a blank on what.
In FO1, FO2, and FO3, the character starts out from a society that doesn't use money. But if caps were dollars, people wouldn't leave them laying around as much as they do.