The windows on airplanes are specially engineered and contain all manner of unique technology to help keep the airplane cabin pressurized and temperature controlled. If a window were to break mid-flight, it could lead to catastrophe. Items would be sucked out of the plane, and the noise would be way too loud. That's why if we saw this on our flight, we probably would ask to get put on the next one.
While we would turn around as soon as we saw this, we do have respect for the people brave enough to stay on this flight.