In his State of the Union address, Bush said that the US is "addicted to oil." Tristero asks: "And what do addicts do when they don't get their fix?"
Steal, lie, rob their grandparents (or grandchildren). They become irrationally violent. Uncontrollable.
In short, Bush just put the world on notice. For the next 20 years or so, America's official policy is "Anything for Oil."