When my children were younger and needed to be picked up after school or from summer camp, parents got maps with directional arrows and written instructions. The unspoken message was clear: Don't start no mess in car line, won't be no mess in car line. That's not what happened earlier this week in New Orleans, La., at the Treme Community Center. Parents in car line and the children waiting for them witnessed an off-duty New Orleans police officer gone mad.