It's a controlled democracy, it's not brutal and it's not a dictatorship[1]. What gives U.S. the right besides it's carrier groups to say what kind of government the Iranian people should live under? The head of state the Iranian people last officially recorded as having overwhelmingly supported in 1979 is more legitimate than any kind of leader or government U.S. might say they would like to foist onto the Iranian people. The U.S. has indirectly caused multiple times more deaths and suffering in Iran that it's current government ever did.

Who is brutal, and who is trying to dictate?

[1] https://en.wikipedia.org/wiki/Political_parties_in_Iran