Matto - I missed your post/question about the 1950 vigil as my date for Pius XII.
Yes, in my opinion that is the only way of defending the use of the pre 1955 liturgy. It would be inconsistent in my opinion to say that 1955 went too far when the same thing happened in 1950 on a smaller scale. However, many don't condemn him at all. How they justify using the pre 1955 over the 1958 missal while claiming obedience I do not know(did you hear that Ambrose?).
I do believe that Pius XII erred concerning morality with his allocution(which is significant, I reject it as not Catholic)(didn't our Lady cite sins against the 6th
commandment? - this could be what she was referring to)(the sacred penitentiary rulings were also in the century prior), however I do not believe that his allocution would make him an anti-pope(it was a fallible speech).
Other than that, I found one other thing in his encyclical about creation/evolution that I believe possibly contradicted what Pius X wrote, but at that time I had bigger fish to fry(perhaps I will look into it in the future).
I would like to quote something Fr. Pfeiffer said to me for all of those who worship Pius XII. He remarked to me after a mass that "people don't want to talk about the errors of Pius XII". And, he was right.
5:20 in is about Pius XII -
Canon Hesse is worth listening to. I do not agree with him about everything(I consider his ordination doubtful)(he questioned it too at one point but was coaxed by Fellay), but there is much food for thought in what he says.