It’s never a good idea to leave a child alone in a car, local child experts say, but somehow it still happens as evidenced by a metro Atlanta case Wednesday that killed a 22-month-old. The Cobb County death resulted in a murder and cruelty to children charge for the father, 33-year-old Justin Ross Harris. Authorities said Harris was supposed to drive his son to day care, but instead drove straight to work and didn’t realize the boy was strapped into his car seat until the ride home that afternoon.