If US production stopped completely, or more realistically was 100% exported, pump prices could certainly change in the US. I'm not arguing that point.
Again, my point is that these companies do not have a social responsibility to make gas cheaper for the average US consumer that is leveraged with a gas guzzling vehicle. These companies have a legal responsibility to their investors to squeeze every dollar out of every barrel--at the expense of the US consumer or any other market.
The thread implies that the government sets pump prices. It doesn't. In fact, the US is the only major oil market in the world that is not nationalized.