Ever notice how the U.S. government never calls out Saudi Arabia on its countless human rights abuses? This is because Saudi Arabia is the number 1 buyer of U.S. military weapons/equipment in the world [The U.S. is the number 1 exporter of weapons throughout the world too] and is also a key ally of the U.S. internationally.
Every administration since world war 2, including Obamas, has enjoyed a very close relationship with this corrupt government, which is better described as a dictatorship.
Governments are businesses, corrupt businesses to be specific, that is the most important thing you need to understand about them. Once you realize this, things begin to make more sense.