Truth be told, no one knows whether Iran would or wouldn't use nuclear weapons once it obtains them, or pass them on to Hezbollah or some other group of lunatics. But even if Livni is correct, and a nuclear armed Iran would not attack Israel or any other countries, Iran obtaining the bomb could well cause many other countries to go down that path (indeed, some have already started). Once Iran has it, the Saudis will want to follow suit, as will the Egyptians, the Turks, then the Greeks, and pretty soon a chain of proliferation ahs begun that could reach all the way into Central Europe. MAD has worked thus far, but the more countries that have these things....will it continue to work? I think I'd rather not find out.
Guatemala judge orders detention of president in corruption scandal (Reuters)
from the article: Livni behind closed doors: Iran nukes pose little threat to Israel