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Everyone agrees the SS was called in to arrest members of the Jewish community in central Rome and transport them north. Pius XII was instrumental in stopping that operation, although not before some were taken. He was assisted by sympathetic local German diplomats and priests, and even the local commander (who was later removed for being too sympathetic to the local Jews).

If somebody was a child at the time, their reminiscences would be frightening, and they would not be well disposed towards anyone perceived to be in authority. But their personal experience would not necessarily include any knowledge of diplomatic activity -- especially if the author was a young person at the time. Given the need for secrecy, that's not surprising.

Your initial statement, however, has been demonstrated to be false. Unless you can show something historical and documented (as opposed to the memoir of a young person), I don't see how you can assign blame so confidently.