After 911, War become the only means to the end-- eliminate terrorism through war. But after nearly four years, maybe its time to think about an important question: does the means fit for the end? Can we really get rid of terrorism through a war?
The answer is not as obvious as some people, i.e. George W. Bush, may think. You can kill some terrorists in the war, in a military action, but you can not eliminiate "terrorism" through war, because one of the main reason of terrorism deeply rooted in the people who unsatisified with the world order led by US and terrorism attack is just the one of the resulte of these emotions. War can not destroy such kind of emtions, only if you kill thousands of millions of people in the war.
The explosion in London already give us enough information and we should take a good thinking of the situation now. It's still not too late.