There was a very similar story in Ireland just a few weeks back.
That turned pretty nasty actually.
Here's the youtube clip that did the rounds.
Like a previous poster said, why get off to wait in the heat with a cranky child only to have the child twice as upset on the next bus???
Same in Ireland, asking that mother to get off the bus when it was most likely freezing outside and no guarantee of another bus coming (Dublin buses are the pitts!) is just not on.