USA is not a monolith. I didn't want that. However, my government took many steps that caused that event.
ISIS only existed in the first place because USA invaded neighboring Iraq under false pretense and deposed Iraq's government. ISIS was strengthened in Syria by USA's attacks (both through sanctions [0] and through other violent means) on Syria's government. ISIS was armed by USA parachuting thousands of weapons into the conflict zone. [1] Perhaps the people making these decisions are morons who can't predict the obvious results of their own actions. I suspect they are not that sort of morons.