Israel and America are Irans enemies. Both are nuclear powers and neither has "ruled out: making an attack on Iran. Israel has a reputation for using exotic weapons and killing civilians. America has a reputation for invading nations because they object to that nations politics. Israel and America would not be considering an attack on Iran if Iran had nukes of their own. This means that, for the safety of their nation and it's people, and for the sake of stability in the region, Iran has an obligation to seek nuclear weapons, even if they are not otherwise inclined to do so.
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from the article: Expectations low as world powers begin nuclear talks with Iran