Venezuela and Iran are strategic targets to control China's supply of crude oil. That's pretty much it.
USA can produce all the oil/energy it needs for itself. Everything else is about controlling the energy supply to adversaries.
As the parent comment explains, the US can't produce all the oil it needs, because it's refinery capacity isn't aligned with the type of oil it pumps from the ground.
As the parent comment explains, the US can't produce all the oil it needs, because it's refinery capacity isn't aligned with the type of oil it pumps from the ground.