No one is forcing the US military to maintain bases all around the world. They were put there to protect "US interests" (generally defined as areas of the world with a large American corporate presence, and where instability might result in the loss of American owned property, like oil refineries in the Middle East).
Americans complain about being the "world's cop", but the United States had to be dragged kicking and screaming to help the United Nations stop the genocide in Bosnia, because it had been a former communist country and the United States had no "interests" there. Nor did they have any "interests" in East Timor when another genocide occurred there, and it continued unabated.
Far from being the world's cop, America has been one of the world's great enablers of war, often selling arms to both sides, and then sending in the World Bank to auction off what's left of these nations' assets and resources to the highest bidders. One only need to read the history of the last 70 years, to see the lengths that successive American governments went to in order to stifle the growth of communism, and to keep cheap oil flowing in the Middle East, and you would understand why Iranians consider the USA to be Satan.
The US kept the Shah of Iran on the Peacock Throne for more than 30 years, to keep Iran from aligning with Russia. His was one of the most brutal, repressive dictatorships the world has ever seen. Saddam Hussein could have modelled his most odious behaviour from the Shah, but Saddam was a military man at heart, and had more discipline. The Shah was an entitled snot of a crown prince who became a cruel and enchallenged hedonist after his father's death. Not unlike MBS, but without the veneer of a "reformer", and very much like MBS, his grossest behaviours were excused, tolerated, and allowed to continue because "Better dead than red".