Now try to reconcile that speech with ER's post above.
As he pointed out.
Unfortunately, even the most brutal dictators stay in power because they have a substantial number of people who support them, and a passive or inneffectual majority that opposes them. Without organization, communications and media, and the right (constitutional or illegally seized), to meet and speak and assemble. No majority, no matter how courageous, can overcome the oppressive machinery of the state, or of a cultural or religious meme with sufficient grip on its followers.
A civil war in Iran would be far more preferable to a nuclear armed Iran under control of Ahmadinejad and his backers. I'd much rather see Iran in flames than as a nuclear armed regional superpower. Rip the persian rug out from under their feet and give more moderate voices a chance to come to power.
You could also call it payback for them supplying arms to their minions inside Iraq.