The bottom line is that the Gedolim know a lot more than we do and we have no business criticizing them even when we know exactly what happened. In this case, as I pointed out earlier, we have no clue what happened so we certainly can’t criticize. We don’t know exactly what the girls said and how they said it. We also don’t know exactly what Rav Shach zatsal said and how he said it.
I can tell you from my experiences sending sheilahs to Rav Chaim Kanievsky, Shlita, that he clearly has Ruach Hakodesh and knew exactly what I needed to hear. Since Rav Shach zatsal was even greater than Rav Chaim, I assume that he had Ruach Hakodesh and knew exactly what the girls needed to hear.
I would also add that Rav Chaim has always treated my questions with the greatest respect. I don’t ask him questions on Ramban that anyone can answer. I ask him serious halachic sheilas after I have gone through all the sources (including Gemaras, Rishonim, Shulchan Aruch, Mishna Berurah and contemporary Poskim) and have determined that it is a difficult sheilah that no one else would be able to answer but him. I also ask him serious hashkafa questions that no one else would be able to answer.
Please keep in mind that the girls were acting with a lot of chutzpah. We tend to have this attitude that we can just waste Gedolim’s time on any dumb question as though they are our servants and should be available for whatever we want. A Gadol’s time is precious, and it is very chutzpadik to go to him with your schoolwork instead of going to your teacher!