while this is a good lesson its not really too relevent in the situation...actually, these people are pointing at what they want to shoot, the sky. They don't quite understand that they will come down again.
By the way, I think they do understand the physics of it. It's like any stupid thing people do anywhere. Once you grab them by the shoulders and say "Yo! Stupido!", they start to get it, as the article illustrates.
I wonder how much kinetic energy a round from an AK has, after being fired straight up??? Probably would be lethal...