1.The CIA is a tool of people that want world war.
3. It's not about oil dependence, it's about currency validation. The US made a deal with the Saudi's way-back-when that their oil could only be purchased using American Dollars. This means that countries all over the world are forced to use our currency which is what gives the dollar its strength. It's not about the Saudi monopoly, its about the US's monopoly.
If Saudi Arabia were to get pissed at us all they would have to do to punish us is sell their oil for any other currency. This would crush the US dollar and the US would more than likely go to war to save itself (especially if deep staters were in power). Saudi Arabia would buy militaries across the globe to come save it, hence another way to start a world war.