A. There still is no proof of a nuclear weapons program at all in any way.
Well, of course they're researching nukes, and that's fine. I mean, they're surrounded by US troops in every direction, and the US already invaded two of their neighbors, so of course they want nukes. And they should be allowed to have them.
Sad part is, if the US & Israel become the aggressors in this conflict, and fire the first shot, I think there's a good chance Russia and China will back Iran, and that will cause absolute hell on the world. That will be WWIII, and not a period of time any of us want to live through. If war breaks out in Iran, and especially if the US are the aggressors, I don't think China and Russia will sit on the sidelines like they did with Iraq and Afghanistan. Iran is very much in their national interests too, and they're not going to let the US take the entire middle east.
To think Iran is going to be an aggressor in global conflicts though is absolutely insane. They're surrounded by US troops, intelligence is gathered, military plans drawn up, a couple US carrier groups in the region, a few US nuclear subs secretly floating around, each armed with 18 triple tipped trident nuclear missiles, and that's just the tiny bit I do know (which isn't much).
Iran is in such a corner, it's basically impossible for them to make an aggressive move. And if they ever did, the shit storm that would reign down on them would make the "shock & awe" Baghdad campaign in 2003 look like an 8 year olds fireworks kit display.