i agree with you - someone unhinged enough to do this will offend again or be suspected by others. Or is being protected by someone. Also agree that it's likely the shooter was more familiar with a handgun than not. So how does that happen? Is she law enforcement? Is she former or current military? Is someone in her family one of those? Women are known to own and use firearms, I know - I'm just looking, again, for an angle. Side-story: in college there was a guy, strange, alternative, who wore a bathrobe around campus. He was belligerent, socially volatile etc. He had long, stringy hair. He was really angry. Is there a young angry man similar to this guy that lives with his parents in the neighborhood?