The Hunger Games prequel The Ballad of Songbirds and Snakes gives a new perspective on why Snow became evil, but Panem's President still cannot be redeemed after the gruesome crimes he committed. Origin story prequels often aim to make a previous antagonist more sympathetic to audiences, and The Ballad of Songbirds & Snakes is no different. In the case of Coriolanus Snow, his vile actions were just too extensive to be excused with understandable motivations. The Ballad of Songbirds and Snakes attempts to show where Snow came from without ruining The Hunger Games' terrifying villain.

https://screenrant.com/ballad-songbirds-snakes-president-snow-changes-evil/