What is it for?

This is frightening. First, it's just frightening. Secondly, I don't seem to be able to watch something like that any more without questioning my motivation in watching. On the one hand it's good to question your own motivations: on the other it means I turn everything into a question about me. From the comments most people's reactions are to do with what the armoured vehicles should have done. If we could work out the answer to that question it might still not neutralise the video clip.