Everybody now seems to accept a nuclear Iran. Sanctions certainly could have worked, but they should have started 3-4 years ago. Until they will come into effect they will be rather meaningless. Oh, perhaps all the world leaders will decide to completely bar trade with Iran, but that's not going to happen. Germany wants money from Iran more than stopping it, and it is not alone in that.
Obama is a weakling, and Bush wasn't stronger. Bush created the new Vietnam trauma with the Iraq war, and the Americans are not going to bomb Iran. That leaves Israel. But in actuality, Israel is not in any greater risk from a nuclear Iran than Europe or the US are. Actually, I would venture that if Iran gets nuclear weapons a bomb will explode in the US before it explodes in Israel. And make no mistake about it, a bomb will explode killing many thousands or hundreds of thousands, or millions. It's inevitable. (oh, and it's very unlikely Israel will attack).
Why is a nuclear Iran a problem you ask? We should negotiate and live in peace with them. That sounds nice, but if now they are not listening to the west, what makes you think that the moment they have nuclear weapons they will start to. What would the world do if Iran invades and takes over Saudi Arabia? Absolutely nothing, just as they are doing nothing now. Saudi Arabia knows that and hence a nuclear Iran means a nuclear Saudi Arabia. What about Qatar - the same, the United arab emirates - the same, even Iraq. What would stop Iran from attacking and taking control of a militarily devastated Iraq?
As you see, a nuclear Iran means to nuclearize the entire middle east. Perhaps you think this is a good idea and if everyone will have nukes, like Russia and the US, everyone will live in peace. Nice idea, but it might be strategically beneficial to Iran if a nuclear bomb explodes in the center of Manhattan, and as it won't be traced back, or at least not conclusively, they will do it. just the same as they bombed a peaceful jewish center in Argentina killing many. They proved again and again they like the terrorist means and they will use them with nukes.If not them, maybe a renegade from Saudi Arabia, or Qatar, or... Again, the entire middle east will be nuclearized.
What then can be done? Extremely strong sanctions: nope. It can be done but it is so clear it won't be done in any effective way.
The only solution is to attack Iran. Not only its nuclear facilities but its entire regime. It's a strong attack, but there is no other way if the world is to stop extreme nuclear proliferation and nukes becoming just another element in the terrorist/military arsenal. If you destroy the regime that will stop the entire middle east and the US from entering into a global war with Iran and its deep pockets. Attack not only the facilities which can be rebuilt but the entire regime! It goes too far you think? What are the alternatives? The Iranian regimes or millions dying from nuclear attacks?
The Iranian people don't understands why doesn't the world allow them to have nuclear weapons while accepting the US, France, Japan, Israel, India, etc.. It's not their fault, but the people who govern them behave differently than those other countries, and that makes a huge difference. If the regime goes away, maybe with a different regime nuclear weapons won't be such a threat as they are now.
A gun which is mentioned in the first act will fire in the last one says Chekhov. Nuclear weapons will not simply sit in arsenals the moment they become commonplace.