Good point. However, given the outcome of the last few American military operations in the region, I'm frankly very skeptical of their chances of even achieving that.

If I remember the articles I've read about the US war games simulating a war against Iran correctly, the American fleet got wiped out in short order and with minimal damage dealt to Iran. And that was years ago, Iran has gotten stronger since, while the US has stagnated if not weakened.

As for causing a civil war, the current attempt at a color revolution has already failed, adding an other failure to the CIA's recent streak of failed covert operations. So I wouldn't bet on any successes on that front either.