I'll bet a 1,000 donut holes this is revenge for the cartoons. Muslims have threatened poisoning the water supply before.
Sooner or later this demented death cult is going to do something the triggers a huge response from ordinary citizens and they aren't going to like it. But it will happen. These people are totally focused on world domination through violence and mass death. My only question to europeans is: What will it take for you to recognize that you are suffering Death by a Thousand Cuts?
Mmmm, I'd love to win that bet, but I'm sure you'd win it! ;)