The range where I grew up as a kid, San Gabriel Valley Gun Club, is now closed. As I understand it, developers built a subdivision of homes downrange and off to the side of the range. Also as I understand it, no rounds ever hit anything at the subdivision, but the home owners got the range shut down because they were fearful that rounds "might" hit their homes.
I'm not saying that's what happend in the circumstances of the OP story. But I'd imagine that sort of thing happens a lot. People move into the flight paths of airports and then try and get the airport shut down.
Can anyone in SoCal verify that I'm correct in the reason that the range in Azusa had to close?