I do have issues with the current idea that anyone is fair game if they're in cell phone camera range. I believe people should have the right to reasonable privacy even if they're out and about as long as they're minding their own business.
However, as much as I may disagree with it, the reality is that what constitutes "out in public" today is quite a lot bigger than what it was even ten or fifteen years ago. Then the only ones who would ever have known this had taken place would be the passenger, the conductor, the fellow passengers, and whoever they told and the incident would have faded away. Now, it's available for viewing all over the world and it's a little part of history.
It's a cautionary tale, isn't it?