The fighting in Libya has stopped the flow of Libyan sweet light crude to European refineries. Which could have caused shortages and a price spike (Which implies a certainty of brevity. If the fighting continues it might become a price hike.) This is even though Libya produces only 2% of the world's oil.
The Saudi government announced that it would increase production to compensate for the loss of Libyan production. Which made the world's stock markets calm and ended the several days of market sell-off caused by the fighting in Libya.
Given that Saudi Arabia is thus in effect the guarantor of the stability of the world's oil supply, it is a friend and supporter of by far the world's biggest oil importer, the United States. Our economy depends on them. Those old enough to remember the oil embargo of 1974 (Brought on by Arab fury with Israel for having treacherously survived their surprise attack in the Yom Kippur War by fighting back and winning.) understand the potential disruption of our economy of an embargo that could not be called off if their regime were overthrown or crippled by prolonged civil war.
"Disruption" in this context means losing our jobs, our businesses going under, and the price of gasoline tripling.
In this context it is well worth noting that today police fired over the heads of demonstrators in the city of Khatif in the oil-producing Shi'ite majority east of Saudi Arabia. Saudi Arabia is the staunchest of Sunni regimes yet the eastern provinces, those on the Persian Gulf, the ones with the oil, are Shi'ite. The relationship between Sunni and Shi'ite in Saudi Arabia is no worse than that between whites and blacks in Mississippi in 1951. Everybody is polite but...
And now Saudi Shi'ites have heard of freedom riders in Tunisia, Egypt, Bahrain, Yemen, and Libya. The Soviet Union was rumored to have instructed the American Communist Party to put its few pitiful resources toward helping the Civil Rights movement embarrass the United States in the 1950's and 1960's. So too, it is rumored that Iran, a major Shi'ite power directly across the Gulf from the Saudi oil lands, and a perennial rival and enemy of Saudi Arabia, may have a hand in agitating protests against the Saudi regime.
In both cases there is no proof. But in both cases, one would be astonished if it hadn't happened.
In return for protecting our economy, and with it our hegemony, the United States protects Saudi Arabia from its neighbors. The first Gulf War was at least as much about protecting Saudi Arabia from Saddam Hussein's Iraq as it was to recover Kuwait from them. Our navy patrols the Persian Gulf, our carrier groups control the Indian Ocean beyond the Gulf. Which is to say our helicopters and troops stand ready to destroy any Iranian attempt to invade Saudi Arabia.
If you think that is a fantasy scenario, imagine if the American protectorate did not exist. Saddam Hussein would not have stopped with Kuwait. His armies would have marched all-but-unopposed to the Strait of Hormuz at the mouth of the Gulf. Now that Saddam has died cursing, "spies, traitors, and the Persians", those very Persians would be only too glad to do exactly the same thing today.
Were they able to do that, Mahmud Ahmadinejad would control just over half of the world's oil supply.
That is why we maintain such a large navy when no other country has a comparable one. It isn't there to fight other navies as in World War 2 and the Cold War. It is there to control coastlines.
So the United States and Saudi Arabia are cooperative allies. They are guarantors of our economy. We are guarantors of their security.
ON THE OTHER HAND
There are Muslims throughout the world, most of them poor and living in poor countries. And in every country poor people are hard-pressed to educate their children. Everyone wants their children to be able to read, do arithmetic, post on Facebook. Much of the Muslims in the world cannot afford to provide even that much schooling to their children.
But the Saudi kingdom can. And does. All over the world are Muslim sectarian schools called 'madrassas'.