So now your argument is 'they aren't rational because their twitter account said something mean', combined with an attempt to shift the burden of proof.
If Iran's leadership is irrational it should be easy for you to show plenty of policies it has pursued that are irrational. What are these policies? So far we have the policy of saying mean things sometimes. What else?
what do you have to support giving them a nuclear weapon?
Faith?
For years they said they weren't working on nukes, until this deal comes along that Obama so badly wants to happen, and now we know they have been working on nukes.
If your take says its rational they were working on them, then why is it irrational to say the will use them?
One of there goals is to get rid of Israel, which they have worked against by funding groups attacking the nation. Now the 'great' Satan has allowed it to have both nuclear weapons and reopened billions of dollars which the the country will use to re-arm itself and others.
If a country has for years said it would destroy another, and for years worked to destroy that country, and now has the same capacity for destruction as the country it wants to destroy, what makes you think it wont destroy them?
Until now Israel had the trump card with nuclear weapons. A little while from now they wont. If you think that wont change the game for worse, for that country you are a fool.
Even Obama thinks so, which is why he wants to give Israel billions in weapons.
If as you claim Iran is rational and peaceful, and this deal will make them more peaceful, then why do we have to give our 'ally' more weapons?