I don't think anyone here can make an educated guess on whether or not Iran is indeed a threat... First off the media is unreliable, second, the government is not giving enough info.
Also, even though accidental killings of innocent people might occur and supposedly be an inevitable part of war, think of the repercussions it might have on those affected by it. Wouldn't it be 100% justified if a relative of a dead innocent victim retaliated against said death? I'd think so. And if that would mean adhering to some doctrin (such as extremism), I can see that too...