The problem is you can't "take out one of their leaders" and expect them to be alright about it and then abide by your rules. As you can't expect the rest of the world to be alright about it either.
You must not know the routine for war, it's always start with the top and work your way down, even on the battlefeild you do that. The rest of the world already hates us, but there is no place millions of people would rather be then America, that's why they sneak in from all over the world.
Remember Saddam before the Gulf War, if you were old enough to remember. Saddam said "war with Iraq will not be a vacation for the US as Vietnam was".
Bush Sr. really F'ed up the Gulf War, he should have kept going and gotten Saddam when he had the chance.
One more thing, why did Vietnam score so low within the US? Apart from the US losing the war, another point was the media showed countless images of American soldiers being killed and wounded. How many such images have you seen from the Gulf/Iraq war? Less than ten I'm sure. It's all part of the media manipulation. Lack of such images only goes to make you think the US are indeed kicking ass in Iraq and nothing is going wrong. The 2000+ deaths are just casualties. Moreover, notice that all of the images of attacks to the US have come from non-American TV stations.
Liberal media will always skew things to make it look like its bad, I have several friends in Iraq right now and they tell me the only thing that sucks about being their is the spiders, the sand, and the lack of entertainment. They think we are doing quite well and are pretty much sick of the media being a bunch of idiots when it comes to the war, all they are doing is catering to the Bush bashing fad that's been going around. I suggest talking to soliders to get the rael picture.
The problem is most Americans who do support this kind of action just think Iran is full of camels and ragheads. Mostly because that's what they've been showing in movies and TV. In the mid-80s the US decided that in order to be superior in the military, compared to other countries, they had to invest in technological advancements. Meaning that the more advanced weaponry they had, the more superior they'd be... but notice how Iraq, with a few pipe bombs and suicide bombers is putting up such a fight.
We have one thing that other countries don't have...a huge air force. Before any ground troops were sent in, the place would be rubble anyways. And it's not like any of us would be detected because we fly stealth missions with stealth planes. Iran does not have the technology or training our military has.
One last note. If it has taken the US more than 2 years to "dominate" a country measuring 168,754 sq mi and less than 30 million inhabitants, most of which were repressed by their own government and in desperate need for a change, how long do you think it'll take to take over a 636,372 sq mi country with around 70 million inhabitants, all happy and faithful to their government because its defending itself against the world's bully. Let alone the fact that similar countries could stand by Iran if such an action were to take place.
How long? I say a year air campangin to blow the living hell out of everything and a good clean up with ground troops and then pull out and go home, we don't need to rebuild that country. In and out at the most 3 years.
The US isn't a bully, we are almost expected to do something. It's damned if we do, damned if we don't. My theory has always been cut the world off and let us just be us and not get envolved with anything. Tsunami hits the far east...not our problem, war in the mid east...not our problem, genocide in Africa...not our problem. Isolationism is a good thing.
In the end, the war is because of terrorism, or at leats that's what they say. Terrorists don't fight armies. Terrorists bomb civilian installations, mainly. If the US attacks Iran, the main loser will be the rest of the world's civilians.
Terrorism is because of Jews, I've said it several times before. If the USA didn't protect Isreal we would have no problems what so ever, but since we feel we have to then we will have to fight off it's aggessors.