Teheran is the puppet master behind all terrorism. OBL met with Iran to get their verbal backing just months before 911. Iran is succeeding in undermining the western world by terrorism and with under-the-radar support of radical islamite terrorists.
Iran is also succeeding in manipulating the ARAB sunnis to the extent that Iran is poised to take western Iraq. The are no bounds to Teheran's ambitions.
Also, like M. Ledeen said, they have been at war with us for 28 years, (since, of course, they seized soveriegn US territory in 1979), we just have never responded with miliary retaliation.
Boy, for all the Libs that say we need to be patient with Iran - IT'S BEEN 28 DAMNED YEARS - isn't that patient enough for 'em?