I think that the OP argument is an unjustified conflation.
That the monk could tell that others were dealing with the situation, and didn't need to prove that he "cared" by fussing about it, it a good lesson. If circumstances were different and he could have done something more useful than what was already being done, then I suspect he would have acted.
Besides, remaining calm may be the most useful thing to do in times of stress, when others are loosing it. Ajahn Brahm sometimes talks about when a woman came into the Wat (I think this was in Thailand, I don't recall the details) distraught because her husband had died (maybe shot or something). The Abbot calmly finished his meal, and the woman calmed down considerably while waiting for him to talk to her. Making her wait was, in that circumstance, a very effective action.