The Muslim terrorists success in attacking and murdering innocent people depends upon countries allowing them free access to their societies. They travel freely from one country to the other, often using forged documents. They count on the "fairness" of other nations who are loathe to openly ban Arabic/Muslim peoples from their country for fear of being seen as bigoted and unfair.
This is an enemy who relies upon our unwillingness to single out a group of people, or take any sort of negative action against a group of people. This is a security weakness in the name of conscience that they exploit openly. We allow the enemy to live among us. Are all Arabic/Muslim people terrorists? Obviously the answer is no, they aren't.
But, how do we tell who is who? How can we be reasonably certain the Arab/Muslim that lives in our town is not a terrorist just waiting for the order to kill and maim us? The truth is, we can't. We have no reasonable way of knowing the terrorist from the peaceful person until it is too late.
We are at war. Not just the U.S., but all Western nations. The enemy has demonstrated again and again that they care nothing about innocent life and rely upon our sense of fair play to make their attacks possible. It's time to throw away this sense of fairness. Every Western nation should immediately begin deporting all Arab/Muslim peoples in their midst and send them back to what ever little sandbox they came from. It is the only way to know for certain that the enemy is not among us.
They should be denied entry into our countries. They should not be allowed to travel outside their own little group of sandboxes. Their borders should be heavily patroled and guarded to make sure they stay put. Satellites should be trained upon them 24/7 to make sure they aren't moving out of their sandbox for any reason. Anything that crosses the line should be immediately bombed out of existence. They should be totally isolated from the rest of the world. Perhaps then they might begin to deal with their problem themselves. They should be the ones to ferret out these extremists and deal with them. A cleric preaches hate and death? They should execute him and those who follow him. A suspected terrorist group member in their neighborhood? They should be the ones to kill him.
These would be extreme measures, but if these people are denied travel and access to our cities, they will he hard pressed to cause death and detruction. It's time for the nations of the world to stand together and say "We've had enough!". And mean it.