It seems like it is a machlokes. R' Wosner said it was because they did not treat the Beis Knesses with respect.
It is the obligation of every individual to maintain the sanctity of the Beis Knesses. Do not eat, do not use phones and do not talk about trivial matters while in a place of such holiness. There are Shuls that will turn half the Beis Medrash into an Ezras Nashim for a simcha. This is completely forbidden.
source Vos Iz Neias
On the other hand R' Chaim Kanievsky is reported as having said that the reason the Sifrei Torah were burned is because they disrepected the Chazon Ish. 50 years ago the Chazon Ish asked the Vihznitzer Rebbe not to use electricity from the electric company on Shabbos but rather to use a generator. Recently, they have started to use the regular electricity on shabbos and that was disrepecting the Chazon Ish who was like a sefer torah so the sifrei torah were burned.
source Kikar Hashabbat
What are we supposed to make of this? How does this fit in with Daas Torah?
As an aside R' Wosner made a startling comment about the holocaust as well:
Our gedolim have already explained why Sefardim were not affected by the Holocaust,” Because they are extra stringent when it comes to showing proper respect for a Beis Knesses.
It always bothers me when someone says that they know why the Holocaust happened or why certain people died and certain people didn't. It is clear that the Holocaust was a time of הסתר פנים and like the age old question of צדיק ורע לו we will never know why.