True enough I could have said "with the support of the then USA and USSR governments", and I very likely would have, if there still was a USSR government. But since there isn't, I can't see what would have been the relevance of mentioning the USSR in this context? I suppose the implication would have been "when it came down to it there was nothing to choose between the USA and the USSR", which wouldn't really have been relevant here.

As for countries with comparable human rights records to Iran which are currently allied to the USA (eg have welcomed US bases), there's Uzbekistan, Saudi Arabia, Algeria for a start.

True enough, the USA colluded in supplying arms to both sides in the Iraq/Iran war, but the backing for Iraq was a lot weightier.