The one country 'destabilizing the region' is not Iran.
The world is pretty small these days. Mass murderers are everyone's business. It's morally offensive to just say "well that's a long ways away, not my problem".
Frankly, it's hubris all the way down. Kalief Browder.
Maybe I agree with you that the US, in 1953, planted the seeds for this situation. If I could punish the people responsible I would, but they're all dead now. Also, doesn't our historic involvement give us some moral obligation to fix it?