Hezbollah was not a aggressive militia group. It was an resistance to illegal Isreali Occupation In Lebanon.

If you consider this to be a cowardly act, then its no more different than the cowardly act of the French resistance against the Nazis.

If the Iranian are cowards then so are the Americans, Pakistanis, Russians, Israeli, Chinese and British.

This is why the Iranian are more than well justified to own a nuclear weapon - since everyone tries to covertly try to overthrow their government, and they do not have a useful deterrent against superpower nations.