Why doesn't the government stop commodities brokers from allowing fuel prices to rise?

A positive feedback reaction by government will do nothing other than exascerbate the problem.
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they are betting their money on the fact that we(public) will continue to demand the fuel.
if we decrease our demand the risk will increase and they won't invest thereby causeing the price to decrease.
this scenerio only applies when all customers lower their demand and that is not going to happen in this global economy.
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Our Government have very little to lose and based on my lifetime experience of Labour – it will be their revenge on the Tory party and on the electorate to do nothing now! When labour are dying they are machievalian to the 'nth' degree!
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The government doesn't regulate the markets in capitalism.
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