Candy Froggie's Lair

I heard the Americans wanna launch an attack in Irak. Of course, they have planned how the country will organize once they'll have got rid of the *baaadies*.
And Georges W. is trying again to impose his rules to Israelians and Palestinians.
I don't want to focus everyday on Americans but why do they always intervene in external affairs -too often with military options-, and besides without the agreement of intenational institutions?

Because they're economically the first power and wanna remain such? Because they feel they've a kind of sacred duty ("we gonna save the world") and have to involve in every conflict?
I wonder.