I'm not arguing in defense of Hermes and you should well know by now I detest his character as well. I'm saying from a foundational lore perspective of Etheirys, Venat's crimes begin from the moment she kept quiet about the Final Days and persist into the present with no current sign of ending. At some point, the death tally as a result of the sundering will overtake that of the Final Days if it hasn't already.

You can draw whatever lines you like. I'll even argue that morally Venat was worse than Hermes because she knew the outcome of it all and still chose to do nothing differently, which was a long game plan of hers as opposed to Hermes arguably snapping in the moment. You're also ignoring that Venat's actions were due to the fear of her people becoming The Plenty, it wasn't all just about the Song of Oblivion.