Your question necessitates the idea that the US is some sort of worldwide nanny state, where anything that happens without an action, the US “let” happen. It’s an innocent question but the assumptions are far more drastic. Reflect on some other alternatives besides “the US is in charge of everything”, especially looking at our track record in the Middle East.
The premise here is correct only as far as it is true that anyone besides the US possesses the capacity to act. Beyond that point, it is no longer charitable to frame it that way.
