"Indeed, Nyarenne was the true villainess all along!"
Maybe it's a difference in culture. Do people normally trust those who call themselves pure and innocent? What about me and how I call myself a villainess and virtuous flower of evil?
It might be something like a liability disclaimer.
Yorda: "I told X from the day I met them that I was a villainess and flower of evil. They never believed me until the moment of their downfall. Ohohohoho."