Considering the mother was shopping at the Salvation Army store in Over-The-Rhine (worst neighborhood in Cincinnati) I doubt if she was much either,paper didn't show her to protect the child I assume.
Either way no stranger is going to lay a hand on my child without severe repercussion.
Not sure if I'd kill them (although it seems like murderers get lesser sentences these days),but you can bet I would hurt someone.While nobody likes an unruly child or to hear one crying nonstop,it's still not their place to correct or touch the child.