With all due respect for Abp. Vigano, I think he lets Pope Pius XII off the hook far too easily.
Possibly.
I cringe at the unsubstantiated and sensational allegations made by the likes of Mary Martinez Ball.
And I applaud Vigano for perceiving the incongruity of Pius XII violating his own Mediator Dei only seven years after promulgating it (ie., which heavily corroborates Vigano’s contention that he was deceived and taken advantage of, because no pope would knowingly besmirch his own teaching and legacy with such a blatant contradiction, as many before Vigano have noticed).
For me, I think the truth is somewhere in between: All these deleterious events came under Pius XII’s watch, but none of it was malicious. I think there was some deception and some naivety, and perhaps during his long illness some license taken by subordinates.
For me, the floodgates were opened upon the election of Benedict XV, and his suppression of the Sodalitium Pianum, which sent a signal to all the modernists that they were able to resume their subversion now that Pius X was dead.