When the people of Flint, Michigan, turned on their faucets in April 2014, the water pouring out was poisoned with lead and other toxins. Through a series of disastrous decisions, the state government had switched the city's water supply to a source that corroded Flint's aging lead pipes. Complaints about the foul-smelling water were dismissed: the residents of Flint, mostly poor and African American, were not seen as credible, even...