I'v raised children, and yes, they do act out, but it is the parents responsibility to leave ANY public place till the child calms down. She could have left her cart by the door, or asked someone who works there to watch it for awhile just as you do when you have to use the bathroom. This man broke the law and was wrong to do what he did, but parents seem to think everyone should tolerate screaming from children. No one can reason with a 2 yr old, so the proper thing to do is leave for a few min. till the child calms down.