Utah Gov. Spencer Cox vetoed a ban on transgender students playing girls’ sports on Tuesday, becoming the second Republican governor this week to overrule state lawmakers who have taken on youth sports in a broader culture war over how Americans view gender and sexuality. Cox joins Indiana Gov. Eric Holcomb, who vetoed a statewide ban on Monday. Holcomb said Indiana’s Legislature had not demonstrated that transgender kids had undermined fairness in sports. Cox, for his part, referenced the potential effects on transgender youth. “I struggle to understand so much of it and the science is conflicting. When in doubt however,...