I don't know the economics specifically but coal, gas, oil are all subsidized too.
This is not a stance I personally hold or reject, but there are many with strong convictions about at least some evidence with regards to this. These people cannot easily be dismissed as tinfoil hatter.
If true the most certainly they should be accountable for the cost of military action and life lost. If false then I don't know how to prove it, proving negatives and all that.
US Shale with Canada and Mexico already made North America energy independent.