Is it really the "Fear of Iran" that unites 'strange bedfellows"? Is everything as it appears?

Our military support of Saudi Arabia is not just to help protect them from external forces but also from internal ones. Meetings between King Abdullah and President Ahmadinejad indicate that the two countries have an improved relationship, and the Islamic Republic of Iran, unlike Saddam Husseins Iraq, does not have a track record of invasion anyway. Internal subversion is now the greatest threat to the House of Saud and it is that threat, as much or more than any Iranian threat, that worries the United States. With Saudi Arabia set to be the sole primary producer of crude oil in as little as 20 years it is very much in the interest of the United States that Saudi Arabia continue to be controlled by a western friendly government. After all, its not like we could invade it like we did Iraq; China would pitch a fit if all that oil fell under American control.