Ever notice how, with changes in temperature (or even altitude) that tiny ding in your windshield can grow into a huge crack?
You aren't generally experiencing 20,000 ft of altitude change, a shift to internal pressurization, subzero temperatures outside when it was 80-100 degrees warmer on the runway, or traveling at hundreds of miles per hour, either.
Did someone put a tiny ding in the windshield?
(If the windshield blows in, it's a lot harder for the pilots to do that pilot stuff.)