If you have been following the water crisis in Flint, Mich., you are aware of how many things had to go wrong for an entire city to be poisoned for 18 months before government acknowledged there was problem.

You’d have to be a big believer in coincidence to think the system could fail in so many different ways simultaneously, with such enormous consequence, without human negligence or malice. Bill Schuette, Michigan’s attorney general, is not that big a believer in coincidence.