I don't think what this young man did was that egregious, but the punishment was necessary as a deterrent to that type of activity. If left unpunished, it becomes much more difficult to establish where the line needs to be drawn in the future. Maybe Marine can elaborate, but I have to assume that it was well established with these men that taking pictures was forbidden. What the young man did, although probably not that harmful, was wrong. You can't let it go.
But this incident certainly illustrates the hypocrisy and double standard that our politicians enjoy. I don't blame the defense attorney for exploiting the Clinton email controversy.