You need to know why ?
1. It is in the best interest of the United States.
2. It is very easy to accomplish.
2. All terrorist actions were financed with money originated fron the Saudis.
3. To solve forever the vital oil supply for the whole world.
We might as well seize the oilfields NOW, rather than see them fall into the hands of someone else (China?) in a few years.
Of course, this will not happen- because Americans are not capable of the geopolitical thinking required, nor the ruthlessness. We just want to be loved, like a Labrador puppy.