The key words were "in the past". Try that shit with us now and you know that we will eliminate their naval forces and begin a war with Iran while we are planted on 2 of their borders.
The last incident you refer to was in 2003 and it's obvious our priorities were elsewhere, but this time around it simply gives us the excuse we need to put their regime out of business permanently.
I think the U.S. and U.K. are less prepared now for war with Iran than they were in the period in 2003. We're stuck in a brutal insurgency. Iran has been able to dip its finger into this because they, like the rest of the world, know that we're unable to do much about this interference. Given the internal divisions in the U.S. (Democratic majority in both congress and the senate) and the wider international community and the overstretched nature of our armed forces, escalation on our side is not a viable option beyond limited gestures. Furthermore, the Iranian military could swamp Coalition forces in Iraq by weight of numbers if it came to a sudden war. Undoutedly Iran would lose heavily, but not before making the already poor situation in Iraq even worse. If we toppled Ahmadinejad would we be able to fight against Islamic insurgents in that country too?