Huge boulder tumbles onto town next to Zion National Park

Another boulder is set to tumble down and smash things-

Massive rolling boulder rocks town of Rockville, UT. Buildings, vehicles damaged; another rock unstable. By Mark Havnes. The Salt Lake Tribune.

In the comments to this article in the SL Trib, one person wondered if folks looked uphill before they built?  I have often wondered about this in towns set in deep canyons.