It's not that the players are complicit with the regulators, it's that the rules allow much latitude for Ibanks and their house owned hedge funds or equity pools.
Oil companies buying futures in their own product is the reason the futures exist. They're not the ones driving the futures market through the ceiling. If you'll think it through, they have to have a willing participant on the other side of the transaction. That guy, and his massive pile of funds, is the reason for the massive liquidity in that market and the rising prices. The oil company is simply locking in a future delivery price within its operation and likely offsetting another transaction. The guy providing all of the money into that market, he's the one with no other purpose than place a bet that the price moves big and make a fortune off said move.