and Jothar, I don’t think Rav Miller ??”? said the chilul Shabbos itself was the cause. I think he said it was the rapid deterioration of Yiddishkeit in Europe (or elsewhere) in general. Chilul Shabbos is a key element to Yiddishkeit, and he observed it personally, that’s why he pointed out Shabbos.
(reading your last post seems to me that you’re actually slightly ridiculing this great Godol, sarcastically. I surely hope that’s not the case.)