Fighting terrorism is not unlike fighting a deadly cancer. It can't be treated just where it's visible - every diseased cell in the body must be destroyed.
“Ayman Zawahiri, Osama bin Laden's deputy, as well as Abu Musab Zarqawi, have made it quite clear in their internal propaganda that they cannot win unless they can drive the Americans out. And they know that they can't do that there, so they've brought the battlefield to the halls of Congress.”
“No religious position is loyally served by refusing to consider annoying theories which may well turn out to be facts.”