Because it would require a boots on the ground invasion to occupy the entire portion of Iran overlooking the Strait.

The strait is physically open but no insurance company will cover massive oil carriers because they are so easy to hit with small weaponry from the ridges of Iran.

After all has been said about the ages of Biden and Trump, it’s ironic that having presidents with experience living through Vietnam and the Soviet-Afghan war has been so useful for their two terms.

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The US could/can, they're just not willing to undergo the mass casualties it would take to put boots on the ground and put those boots up the ass of the people controlling Hormuz. Which absolutely cannot be achieved purely by air.