I actually have a special sympathy for the ugly sisters. I think they are in some ways just as trapped as Cinderella, except for them cruelty, meanness, covetuousness, and malice are all mixed up in their experience of love. Who amongst us didn't grow up believing everything our mothers told us about ourselves and the world around us? How many of us are pure, resilient, and wise, despite our miseducation?
The ugly sisters want love as much as Cinderella does. But they have been betrayed by the people whose job it is to show them what love really is. It could even be argued that Cinderella is luckier than them. Evil abuses and imprisons her, but it does not invade her heart. She is able to make free choices about herself. Her struggle is a hard one, but she can recognise truth, magic, real love. For the ugly sisters, their imprisonment is so complete, inside and out, that they don't even know they should struggle.
So it seems, often, with this society of ours.
part two here