I'm no great scholar on government, politics or any of that stuff, but here's my theory based on the people I talk to...
Gas prices are up because quite frankly we are still buying it at that price. Plain and simple. Why decrease the price when people are willing to pony up the money (from a business standpoint)?
I have talked to many people that complain to high heaven about the gas prices (myself included) however very few are combining trips, cutting down on their driving, using more economic means to travel short distances (bicycles, scooters, etc), or getting a more economical vehicle fuelwise.
Since the gas prices hit over $3.50 I've cut my traveling down considerably, combine errands with friends sharing the gas cost, don't make unnecessary trips, and use my bike more. I'm now considering buying a scooter for the longer trips that are too long for the bike, but too short for the car. At 80-100 mpg they are a nice idea.
If anyone knows much about scooters (150cc -250cc) please give me your opinions. If this is an inappropriate place to ask this please let me know and I'll delete this portion of my post.