What did I say that didn’t actually happen?
Let’s review:
"The U.S. support kept the Shah in power " do you deny this actually happened?
“The Shah acted brutally” do you deny this happened?
You can use all the counterfactuals you want but those are the historical facts.
Also, other counterfactuals exist, perhaps Mossadegh would stayed, perhaps he would’ve replaced by something better than the Shah (not a very high bar), the point is that what actually happened is that the U.S. supported a murderous dictatorship and thus Iranians were/are angry about it.