After 23 students were arrested in the span of three days for fighting at a Louisiana high school last month, Michael La’Fitte II’s 16-year-old daughter was scared to go to school. “My kid was visibly shaken,” said La’Fitte, 40. “Her classmates felt the same way.” He reached out to other parents of students at Southwood High School in Shreveport, La., and organized an urgent meeting on a Sunday afternoon “to see what we could do to mitigate the issues on campus,” he said. The parents hatched a plan. A group of five fathers came up with a concept called “Dads...