@Raikuha : I would say it's true that we want "reasonable" villainess. But the fact is when the MC is the Villainess we can more or less get a justification of their actions.
I can't remember the name of the korean manhwa (To Be You, Even Just for a Day) I was reading but it had 2 FL. Evil FL, went to the temple to commit suicide, got saved by white locus FL. Body swap event. I preferred the evil FL, but the innocent FL was actually an extremely good person. She's innocent cause she was imprisoned her entire life. BTW the Crown Prince is the main antagonist in the manhwa.
I feel like if we got the evil half-sister's POV, we might feel pity for her. The elder sister's actions might seem condescending. But alas, she's the antagonist in this story. So she's meant to be hated.
EDIT: Just remember the name of the manhwa