Wow.
I remember back during my freshmen year of high school when this happened. It's strange: at the time I didn't really give it much thought. I just kind of shrugged it off and thought, "Ah well, people are screwed up."
As I'm older now, I find that I consider and process incidents like this much more. This flash was a reminder of that day, but it hit me harder today.
I don't know if there's a cure for this kind of behaviour, and frankly I don't think there is a clear cut solution. I suppose it's just important to realize how depraved we can become as people and how horrible this can be. This flash did an excellent job showing this very thing.