Flint, Michigan had been built up, then abandoned, by General Motors. In 2014, as part of a plan to save money, government officials decided that Flint would temporarily switch its water supply from Lake Huron to the Flint River. Within months, many residents broke out in rashes. Children stopped growing. Some people were hospitalized with mysterious illnesses; others died. Despite the murky, foul-smelling liquid pouring from the city's faucets, officials...