It's been said that the average American hasn't sacrificed anything for the war effort.
If Chavez cuts off our oil supply, I'm willing to change my routine and deal with the results.
He can't be allowed to blackmail us.
If Chavez stops the oil he stops the money. If there is no money there will be a revolt. It is unlikely that Chavez will do anything long term because he likes to breathe and really likes to hear himself talk. That would be hard to do when the peasents put his head on a pole.