It really wouldn't be that simple. The people of Iran regard their land and the bodies of water surrounding their land as "holy". When the sailors trespassed on their "holy" land, they, in a way, insulted them, I suppose (though, in my opinion, it seems ridiculous that they'd make such a big deal about it), so I suppose it's only fair that they apologize, despite how pointless it may be. Threatening them would only blow the entire issue out of proportion, and cause an unnecessary conflict.
__________________
|