Is that they require dead bodies?
Here is a perfect illustration of my point.
If you are going to use the innane and stupid analogy of foreign affairs as a criminal court, at least remember that detectives look for more than smoking guns. they look for motive and opportunity.
For motive, look to their rhetoric against Israel, the time they spent with first madman Saddam Hussein, and now a Shiite dominated Iraq on their border.
(side note: We need to dispel the idea that because Iraq will be dominated by shia it is a natural ally of Iran. Not true. This is not the way revolutionary totalitarian states work. Iran will not abide even the possibility of a pretender to the throne of Shiite Islamic Revolution. This is why the Soviet Union had an almost 30 year border conflict with Beijing. The Soviet Leaders' and Mao could not stand the idea of the other being the Prettiest Comrade at the Ball.)
You can also look towards the defeat their ally Syria took in being forced to back out of Lebanon.
Not to mention the fact they are a huge oil producer in a region of oil producers. Could they use uranium for nuclear power. Yes. But they don't NEED nuclear power. It's like a vegan telling you he's carrying a gun because he's going hunting.
So yeah... If you spot a guy walking down the street dripping with blood and wielding a cleaver, is it possible he's a butcher? Yes.
If he's doing it while shouting, "Death to Israel, Death to the Great Satan?"
Something about that probably isn't kosher...