It was only a matter of time before those annoying horns lead to violence. It reminds me of the Waco standoff and the police started playing different sounds through loudspeakers to try to upset the cult followers. I believe some of the sounds were like babies crying or animals moaning. There is some instinctual urge to want to do anything to make certain noises stop. And now we know our next weapon against the terrorists.
My favorite line in the article is at the end when they say the newest innovation is the combination of a vuvuzela with ear plugs.