Doing nothing and letting Iran go nuclear will also have consequences. Some predictable, but most not. Stopping them is better than having a world-wide nuke race with all it unintended consequences... In finding excuses to do nothing, Adm. Mullen sounds like an echo of Chamberlain of 1939...
U.S. House Speaker Boehner brushes off call for his ouster (Reuters)
from the article: Barak: Iran poses no immediate existential threat to Israel