Confirmation bias is a hell of a drug. It's understandable that people don't want to believe that bad things will happen, because bad things are bad, and good things are better than bad. The problem is that the human experience is, in general, a decades-long lesson in learning to make sure that your shoes are tied before running on a treadmill.
The Michigan football world has spent the past year or so believing that the power of friendship and magical thinking would be enough to beat the cheating rap that has rapidly been built up around the program.