Anyone invades the US, there are thousands of citizens who would use their weapons to fight alongside the military. The Shah did some damage to Iran's people, but not near as much as Khomeini has. The US backed him back then, although not his actions against his people, and the mistakes were shown all along, until now when one president decided enough was enough. I dislike Trump, but him in power now is doing what the US let go the years before. Again, you can't judge the US by the actions of the politicians, as many have been opposed to many things that have gone wrong over the years. Good and bad has happened.