I resent your implication that I did not properly care for my tires.
Below are two pictures. The first showing typical weather checking. The second is the picture of my tire with the one foot long crack.
The first picture shows cracks in the rubber that are both vertical and horizontal and are jagged looking. This is the appearance of a weathered tire.
The second picture is my tire. Note that the cracks are only horizontal and are smooth...almost like a cut. A foot long smooth crack in a tire is not weather checking. The liquid you see on the bead is Dawn dish soap that I squirted on the bead just before I took the picture.
I thought of posting this publicly but decided private message was better. There...I feel better.