US-Saudi Arabia relations

This post is overdue. What's the deal with US-Saudi relations? Why are we close allies? Can it really be all about the oil? Wikipedia says that the "core logic underpinning the relationship" is the provision/exchange of oil for security. They sell us oil, we sell them weapons. I am not the first to say that it is past time the United States reevaluates its "friendship" with the Saudis.

The United States of America and the Kingdom of Saudi Arabia could not be less alike as nations. Saudi Arabia is a theocratic Islamic monarchy. Meanwhile, the US is a secular, constitutional republic founded by Christians. The US is one nation out of many peoples, while the Saudis are one royal family that united four regions. The United States fancies itself the world's oldest democracy. Their nation-state was founded in the 1930s, what we would call modern.

And yet, the US is the Saudis' largest trading partner, and Saudi Arabia is the US' largest export market in the Middle East region. 

Whatever geopolitical context has kept our countries allied since the Saudi's inception, times have changed. The US should reevaluate its partnerships with the Saudis. 

Consider the following dates/events:

• 9/11/2001: Saudis conduct the deadliest terror attack in American history and the first foreign attack on US soil since Pearl Harbor. 
• Fall 2018: American journalist Jamal Kashoggi is viciously murdered by Saudi hitmen in Turkey. American intelligence attributes the plan to the Saudi crown prince known as MBS.
• 12/6/2019: Active duty US soldiers are killed on American soil by a Saudi air force trainee
• Their ongoing war in Yemen
• Etc. etc.

Dalle image of futuristic-looking weapons in the desert