1- You said the democratically elected governmen in Iran was overthrown by US. This got me interested. Whích year was this? Do you have any source on that?

2- I believe it would not be good if US overthrown also the current regime, as this would leave a power vaccum and many groups would try to fill it, making creating a civil war like what happenned when US tried to take Assad out from Syria. Then ISIS came to take power, and the same in Lybia, where many groups are trying to fill the power vacuum thru violent means.

PS: You are probably a libertarian, so you might have other perspectives which doesnt include solutions made by big governments