Iran isn't trusted by the international community; a recent poll, with 28,000 participants, taken in 20 different countries, half of which are developing nations and therefore definitively not western, found Iran to be the most unpopular country in world. If people don't trust Iran, why should they not try to prevent it from creating "breeder reactors" (these are reactors that are capable of, though not necessarily used for, enriching uranium to bomb-grade levels)? The consequences of the misuse of nuclear weapons would be quite dire, and the US hasn't used any in a military capacity for over 50 years despite getting bogged down in many dire conflicts, nor has any other nuclear armed power. However, what if Iran is the exception to the rule? What if, despite itself, internal turmoil allows Iran's bombs to fall into the wrong hands? Why should we take that chance? The carrot packages that have been offered to Iran are costly, and therefore it is absurd to argue that the inspiration for them and the greater effort to stop Iran from making breeder reactors is motivated by economics. Fears over disruption to Iran's oil supply have raised oil prices and therefore hurt the economies of importers, the US prime among them. Rightly or wrongly, many people think Iran is trying to get nuclear weapons, and that is what is motivating these efforts.