However, that said, children cry. They can't talk so they have no other method of communicating what they want with their parent. This can be frustrating enough for a parent to try to figure out what their young child wants, without the added stress of being dumped out on a street corner.
Bottom line, the child was not being wild or out of control, she was simply crying. The article states that the mother was doing everything she could to try to help her child. Trust me, as a parent, when your child cries in public, you realize that everyone is watching and you want your child to stop as much as everyone else does. I've never heard a single person, no matter how much they love their child say, "I love it when they cry!"
If the bus driver was unable to perform his job due to such a simple distractions, he needs to be the one getting off the bus...and looking for a new job. A job requiring social interaction is clearly not for him.