A fool and his money are soon parted..
Obviously the 'user' is as much a child as the one crying if not more so.
Agreed, an actual lesson would have been to buy the pies, offer the child one
IF he behaved, and aplogized for disturbing others, who also wanted food. Instead he went for hurting the annoying child. He no doubt has headaches from many aspects of his self centered life. The man was NOT missing work, in need of medical treatment, or starving; if he over reacts to one kid misbehaving, he'd kill around homecoming in my town. Maybe the kid was getting sick, just over being sick. Ideally, the parent should have taken the child outside, but maybe she was getting food for other members of her family.
I see kids acting like stores are playgrounds also; I find a parent, or better yet, store employee, and explain the child came close to running into a a stack of merchadise/climbing the shelves, or stabbing themselves with sharp objects. That often gets results.