My worry with camera shaming is that the poster can choose to show only the part that incriminates.
I witnessed an event on campus where an individual antagonized a security officer for 10-15 minutes. The security officer tried to take the high road, tried to defuse the situation. Eventually, when the security officer had exhausted his options, he called for reinforcements.
The three of them then apprehended the individual. At that point in time, the individual kept saying "Why are you doing this to me, I am not doing anything"
The video that went around via email only showed the last part of the confrontation. This made the antagonist appear to be the victim and the security guard appear to be the villain.
This definitely can be a huge problem. Selectively cutting film can make someone look like a monster. In that situation is sucks, you can really only try and sue for defamation of character, which is very hard to do.