The possible war with Iraq isn't about any assisination attempt again't '41, although I'm sure that made it personal for '43. It is about Hussein, a blood-thirsty despot that has proven to have no regard for human life, who has murdered hundreds of thousand of his own people and has attacked neighbors without provocation before, is stridently pursuing nuclear weapons capability. On top of that, he supports terrorism with training, finance and other logistical needs.
America does not have enough bombs to blow up the world 20 times over - that is a myth created by those who aren't familiar with nuclear weapons. We have them, and so do a handful of other Western nations, and like the other Western nations, we are not about the business to use them in an offensive manner. We are nations of laws, not atyrannical rule of madmen such as Hussein. There is no reason to believe that Hussein would not use a nuclear weapon just as easily as he uses chemical weapons, and there is no reason to believe he would not place a small nuclear device in the hands of terrorists willing to use it, provided he had the weapon.
It will be extremely expensive to wage war against Hussein, but unless he fully complies with the inspection and disarmament demands of the United Nations (and, we aren't alone in this demand and probably won't be alone if it becomes necessary to go to war) it would probably cost more than the nation would want to pay not to depose him.
You raise an interesting point, and one that I see from a different angle. Deposing Hussein would liberate the Iraqi people, not destroy them. To continue to allow them to suffer his rule is hateful.
Also, the U.N. is not responsible for the security of the united states of America - the U.S. is. More than just cowardly, to only go to war against the madman in specific and terrorism in general if the U.N. backs us would be traitorous to the nation.


Thats because there is nothing within them that COULD leak. They're 99.5% solid state. With that
last .5% being harmless chemicals such as Tritium which is found in every sample of sea water. 
