My sincere condolences are with London, but until they begin to deal with just who the enemy is they won't begin to defeat him...and that goes for us as well. It is fully rational, within a certain Islamist mindset, to do these actions. They are not insane, they are ardent adherents to a religion that is a force for evil in the world. That is not to say all muslims are evil or even bad people. Many are not as ardent in their adherence to the strict interpretation of Islam that the Islamists do...but make no mistake, they are being faithful to the quran and to the history and actions of Muhammad. We can puzzle about it, but world conquest is indeed the goal of Islam...and I'm not being melodramatic, simply factual.
The deafening silence of Muslim leaders leads me to believe that the above statement is not true. It's time for us to get our heads out of the sand and face this threat head on.