Education Secretary Betsy DeVos vowed Thursday to replace what she branded the “failed system” of campus sexual assault enforcement, to ensure fairness for victims and the accused. “Instead of working with schools . . . ,” DeVos said, “the prior administration weaponized the Office for Civil Rights.” “We must do better because the current approach isn’t working,” she said. DeVos spoke to about 100 invited guests at George Mason University, where protesters had gathered outside, worried that she would announce changes to the way sexual violence cases are handled on campuses across the country. “One rape is one too many,”...