I agree. I watched it, and wish I could erase the images from my head. On the other hand, there is a legit purpose in viewing it.
Until you actually see it, you can't really imagine how bad it is. For the vast majority of people, it is a horrible, horrible thing to watch that impacts you tremendously. The "value" in that is in recognizing how many people see it but do not not have that reaction. I can't imagine ever doing something that ghoulish, but what is stunning is the lack of outrage from most of the Arab world. It gives you a window into how alien that culture and mindset truly is.
The other thing it does is make you really question all those folks who are still blasting the U.S. about the prison abuse -- which we investigated and stopped long before it became public -- but are relatively silent about the murder of Mr. Berg. All of a sudden, the opinions of those people matter a lot less than they did before.
Sure, it may be possible to make those determinations intellecutally without seeing the video. But when you actually see it and feel your own horror, you will have an understanding of our enemies that words alone cannot possibly convey.