"Interests." I'd love to know what the price per barrel the U.S. has paid in the last few years when you factor in additional costs incurred due to involvement in Iraq and Syria.
We're certainly paying more than it'd cost to just drive EVs.
Retail fuel prices are already higher than that, even ignoring subsidies, military operations and environmental externalities.
While oil is a major interest its hardly the only one.
USA is still playing at being world hegemon in competition with china and to a lesser extent russia. Maintaining alliances is a part of that.