It must be somehow connected with I-25.
As you travel North of Monument Hill, common sense becomes rare and fleeting as you pass Castle Rock, Lone Tree, Aurora, Denver, Thornton. If you make it to Boulder, common sense dives under a rock and hides. Make it North of Ft. Collins, common sense returns. However, the whole area around Red Rocks amphitheater is permanently brain dead as a result of John Tess concerts.
Areas more than 20 miles East or West of I-25 seem to be pretty immune, with the exception of Vail, Frisco and Crested Butte. Tourists infected those.
What we have here is... failure- to communicate.