No one claims that present wasn’t caused by the past. The question is who bears moral responsibility today for a regime that Iranians placed in power, that Iranians (a large enough chunk at least) continue to support, etc. Iranians are not uniquely automatons. They own their regime at least as much as anyone else, especially at this point. That US actions set a chain of events in motion does not absolve Iranians of everything they decided to do since.
You are confusing causation and fault/responsibility. The US interventions, the Shah’s personal decisions, the ayatollahs’ decisions, the rise of Islam, the Persian Empire, the first humans who left Africa, are all causes of the current situation. But to determine who is at fault, who is responsible, is a very different question. Proximity in time is only a vague heuristic.
It’s common in every day parlance to mix these concepts up. Legal systems have been confused about the distinction for thousands of years. But the distinction is very important to speaking sensibly about things.
It's sort of trivially true that responsibility for every facet of the Islamic Revolution in Iran can't be laid directly at the feet of the U.S. But, when you screw around with another country explicitly to steal their resources and exploit their people, it's silly to expect whatever violent resistance springs up to be rational and measured in every respect. They may even find it useful to heighten certain differences with the colonizing power to gain support from the people.
But we rightly lay the blame squarely at the feet of the Nazis and their supporters.
Incidentally, in 1953 when the CIA carried out its coup in Iran it was basically run and controlled by people who had made a great deal of money financing the Nazi war effort and then imported a bunch of Nazi war criminals to work for Western intelligence and the space program.
There have also been some books written specifically about Sullivan & Cromwell, which was the investment banking firm where the Dulles Brothers worked and established financial ties to the Nazis, but I haven't read any of them.
As a nation we aren't learning any lesson from history, instead we're letting ourselves be manipulated by psychopathic politicians and regurgitate back what they program us with.
What will happen in the future in that middle east region is also a consequence of the same us policy (nothing has really changed) the US continue to have in the area: hunger for oil at any cost whatsoever.
Let's not blame the Romans for they don't exist anymore. The US exists and should have some accountability, at least to us the citizens. You're either blind or choose to not see, whichever you prefer.
In many parts of the world, 200 km is a long way. In the US, 200 years[2] is a long time.
[1] https://en.wikipedia.org/wiki/Cyrus_the_Great
[2] When I visited עיר דוד/وادي حلوه one of the notable features was its easily defensible water supply. That's an area which has had over 6'000 years of history, with the architecture suggesting very little of it was peaceful.
Even if that’s true on some scientific level, human institutions, human social practice, and the human mind itself, all rely on the idea of agency and responsibility. If you’re going to talk about whose “fault” it is, then you need to speak in those terms, not the mere chains of causation that science can talk about.