We don't have any reason to believe that they would be. In fact, all the evidence is that whilst Iran certainly supports terrorist groups, they have no interest in arming them with anything other than conventional weaponry.
Iran already has access to fairly serious biological and chemical weaponry. Why hasn't a suicide bomber detonated a nerve gas bomb in Tel Aviv? Same reason that Pakistan's nutcases haven't been given a "suitcase" nuke to rearrange Delhi. Because the Iranian regime is not suicidal.
They are a regional player utilising proxies to fight for their political ends - just as the United States does (another of the few countries with a long and storied history of supporting terrorist groups). They have no interest in a one-way ticket to oblivion.
I don't disagree, but the best way to do that would be through removing them from Israel and Pakistan - and France, the UK and North Korea. Since that's an unlikely scenario, the Iranians will get their strategic balance one way or another, sooner or later.
Eventually, the USA will get the clue that her enemies in the region are Pakistan and Saudi Arabia, not Iraq and Iran. The former are where the Islamicist looneys are produced and succoured. Indeed, just as happened in the aftermath of 9-11, Iran - which has its own terrorist problem, by the way - could develop into a really strong partner out there. Especially if we shut up and let Ahmadinejad face an election next year where he has to run on his domestic record.
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