Semi-apologies for linking to David Warren so often but he's just so quotable these days:

It is not strictly necessary to prevent Iran, or North Korea for that matter, from acquiring and deploying nuclear weapons, or stop them from continuing their trade in equipment and know-how with the world's terrorists, and other thug regimes. We could just wait and see what the consequences will be. The worst that could happen is the sudden loss of a few Western cities, followed, I'd assume, by an unrestricted conflagration along the lines of Armageddon. But what's that against the danger of ruffling more feathers at the U.N.?