[Celebrian]

From a literary point of view, the disgrace of their mother would provide motive for Elladan amd Elrohir to join the War, in spite of their father's peaceful ways.

I tend to agree with The Saucepan Man. Is this not an example of Edwardian grace, that the "indirect", as Bethberry calls it, is used to deliberately limit the amount of evil to that which is in the mind of the reader?

The Catholic scripture says of Gorthaur's proposed evil in Ephesians 5:3, "let it not be once named among you". In my interpretation, that would be a way for Tolkien to avoid spreading even more evil into the thought-life of the reader.