Cyrus said:
I don't see [undetected Chinese submarine in firing range to a carrier] 'more dangerous' than an ad-hoc armed speedboat racing towards a destroyer. Perhaps you can explain that point.
Last time I checked, China is not exactly considered an American ally, and is in possesion of a lot of nuclear ordnance; that submarine, especially if armed with nuclear-tipped torpedoes, was in position to seriously weaken American presence in the Pacific theater, in opening move of whatever.
An ad-hoc armed speedboat could do no more damage than visibly unarmed speedboat for that matter, namely that of around 10-30 dead servicemen and one destroyer in need of tugging.
However, I think that you were asking this in lieu of your second paragraph:
Last time I checked, the Chinese did not go around blowing up our ships. But ad-hoc ships in the middle east have.
This argument is void. I'm quite sure that there is nothing under international law that will allow a warship commander to act on his own assumptions on the intentions of unidentified vessels (unless perhaps if these can be legally declared "pirate"). Based on prior events in the nearby waters, the commander can be personally worried more or less, but that's his private matter.
Stressing again that this makes no difference at all for commander's legal options, I've nothing against musing a bit about what he may have privately thought. Clearly, the issue here are not machinegun mounts on the boats, but the possibility that a suicide strike is imminent. I'm guessing that the commander was never seriously concerned about that. Suicide strikes come as inconspicuous as they can make it, not from a bunch of visibly armed speedboats making clowns of themselves.
As an American warship commander in those waters, I'd be much more concerned if a lone boat would ask to dock for help due to some emergency on board. I would pretty clearly state to that boat that they are not to approach, that a party will be dispatched to provide assistance, and that any attempt at docking will be considered an attempted boarding (which I'd be surprised if the international law wouldn't allow use of discretionary force against).
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Chusslove Illich (Часлав Илић)