These days there is no such thing as a safe neighborhood or safe anywhere..
I can easily beleive it happened. The bad Guys are looking for sheep. By his actions and showing the BGs he was ready they headed for easier prey. If I am leaving the houe and see a strange person in the neighborhood or a car idling by the side of the road, I sometimes make another pass by the house.
If the BG sees that you are aware..they will be going to greener pastures...to find a sheep herd.
if I were a BG I would see if the state had a database of CCW by zip code and def not go to one where a high % of folks had them.
You get a CCW because you as a person know that statistical abberations occur...as in the case above.
BTW I am a liberal who beleives in self defense and the 2nd Amendment.