Anytime we're discussing geopolitical issues, "Good" and "bad" are right out the window. As the old saying goes, "One man's terrorist is another man's freedom fighter".
Iran views us as a foreign power meddling in their backyard and neighborhood, and would like us to stop so they can continue their plan of instituting their customs and government structure on their neighbors through unconventional means (what we call terrorism).
We view Iran as a constant threat whose goal is to wage proxy wars on our allies, control their immediate neighbors and generally attack Democracy and replace it with religious rule which isn't super pro-human rights.
That doesn't mean every conflict the US has waged is "good". Yes, the 1953 coup was generally best described as naked self interest amongst the UK and the US. Likewise, the US targeting cultural sites would be abhorrent behavior. However given the choice between the US sometimes doing stupid things and Iran being unchecked, I'll take the occasional stupidity.
