I assume you are asking why Iran shouldn't have nuc. weapons. A detailed answered would require several pages, but in short - Iran and the west have opposing v

I assume you are asking why Iran shouldn't have nuc. weapons. A detailed answered would require several pages, but in short - Iran and the west have opposing views and conflicting interests. The western interests would be put in compromise if Iran gains such a leverage. As a theocratic regime, Iran has been actively exporting it's shiite fundamentalist ideology by force (from Yemen to Lebanon and even some non-muslim countries in South America). It would be naive to think that Iran will stop there. For example, just imagine what would happen if a nuclear Iran invades Saudi Arabia and take over its oil fields. Or if a nuclear Iran decided to block the Suez canal, effectively cutting off all of Europe from China, India and Japan. They don't have to use nuclear weapons to inflict damage upon the west.