You believe that forcing companies to spend hundreds of millions of dollars to modify refineries, to use a more expensive feedstock, to produce the same product already made, would lower prices?
It also just happens to be in the best interests of the producers themselves who, as of now, are just feeding the alligator in hopes they'll be the last one the alligator eats.
Anything else is back to that "all things being eual" canard you stick to.