"The Oil markets should be closed to anyone who doesn't have a material business interest in the use or commerce of oil (as in actual oil, not "oil futures stock market positions")."
If you close off the free market system of trading Oil, what's next? The stock market? You don't have a material interest in each company you invest in, so you can't trade. The Bond market? The Currencies market?
If you shut down Capitalism, you shut down country. If you shut down Capitalism you shut down the very foundation that America was founded on.
If you shut down Capitalism, you end up like the old USSR....except the USA would be called USSA. The United Soviet Socialists of America.