Why? Let's see......................
Most of the higher-ups in the iranian government realize that their "president" is a thug. So they encourage his dilusions and spoil for a fight with iran's "enemies."
They've learned from iraq and afganastan.
The US will swiftly topple iran's dictator, with the inside help of friendly iranian government officials, and set the stage for a massive infusion of US tax dollars. Reconstruction means spreading democracy, right?
Sweetheart deals for the exploitation of the iranian oil fields, spreading the love around to "foreign investors" of course, and a new move toward "democratic elections" which will assure those who assisted in the ousting of an "evil-doer" of a powerful government position and incredible wealth.
All this financed with US tax dollars and US oil consumption at $70 - $100 per barrel.
Nah, too far fetched. That's not even a plausible story. You're probably right, they're just plain nuts.