Make up a graph or chart, making note of when a “crisis” occurs that causes a spike in oil prices. Then graph/chart the decrease later. The delta of the price decrease delays are pure profits.
It's your point you are trying to make, so the burden of proof is upon you. You want a chart, you go make one. Meanwhile, I will stand in support of big business over governmental control, as I am a conservative capitalist. They make money, that's what they are supposed to do, and as an investor, i'm damn glad they do.