More sabre-rattling in Iran | Economist.com : Israel worries that, even if Tehran does not yet have enough fissile material for a bomb, every month that passes adds to its knowledge. The next American president may be less tough on Iran than the current one. If military action has to be taken, Israel may calculate, better to do it before the new man takes over. Moreover, if Israel intends to bomb the Russian-built nuclear reactor at Bushehr, it would be better to do so before it is loaded with fuel, probably before October. Israel might also prefer to act before Iran deploys its new generation of air-defence missiles, which may happen early next year.