Amazing how much terror, fear, hatred and in-fighting you can create with a kitchen knife a video camera and the internet. You don't need a laser guided multi-million dollar high tech bomb.
Thats why the terrorists (and thats not the guy with the knife, he's just a conveniant psycho - its the guy who thought up the idea of the video) wont be defeated even by the might of the US forces.
Only by addressing the injustice (real or perceived) can a stop be put to this horror. I see no evidence that the developed world wants to enter into dialogue on the regional problems in the middle east.
Until some real efforts are made at reconciliation in the region be prepared for more terror.
It took us 30 years to figure it out in Ireland. Similar story in South Africa and the Basque region. The Russians had to pull out of Afghanistan with their tails between their legs.