In what world would a country in a similar situation not support groups that try to counter an invading force? What about the assassinations inside Iran? The terrorist attacks orchestrated by the west? The sabotage of their nuclear facilities? How is it that those things can go on for decades, and then when Iran finally reacts, people go "oh look what these maniacs did, how dare they!"
Do you not care that Iran was on the receiving end of these things, or were you simply not aware?
Iran has been notoriously docile because it knows the US had been looking for an excuse to attack it. Just like Wesley Clarke stated.
I don't know if it is that off-base to be honest, restraint does not mean that they practiced pacifism, just that the response was disproportionately small.