It is because we have more confidence in the oil market than we do in many other markets. For every buyer there is a seller and ever seller there is a buyer. Speculators go long and short and they assume the risk. Open interest is rising because money is seeking a return and commodities have outperformed bonds and the stock market. It is because oil is more valuable than paper money.
The President is right that wars and the threats of war are a major reason for increased oil speculation. Japan, China and Europe have been hoarding oil and therefore speculating that they might not be able to find supply if a war breaks out and the Straights of Hormuz is blocked. Better get the oil while the getting's good. That hoarding has been reflected in the most liquid, transparent market in history, which has alerted the world to this behavior and helped us avoid a price and supply shock later down the road.
The truth is that it is dangerous proposal to allow the government into the price manipulation business. The government should not be in the business of oil price manipulation.