The USofA is refinery challenged, most of its sweet light goes direct to export ports, not to home soil light refineries.
This is a challenge, not a simple switch that can be flicked overnight.
See: https://www.fuelstreamservices.com/why-the-u-s-cant-use-the-... for surface scratch intro to the issue.
But the US already buys only 8% of it's oil from the Middle East. How long do you think they will care to help people that don't want to help themselves? It's more likely they will stop selling to Europe.
If I had to guess, I think American oil companies that operate in the strait selling oil to Europe are the only reason the US is still working so hard to control the strait. It's a lot of money on the table. But it's certainly not for Americans, just for a few rich American oil companies and their European customers.