Considering the classic author who Kara is still quoting in her signature, it doesn't surprise me any that a formerly heroic character has become tainted with an inner darkness. That was a pretty common theme for 'ol Frank Herbert as well. One of the worst was Leto Atreides. When introduced, he was THE hero at that point in the story, but in the final book, he was God-Emperor and seemingly pure evil, though what he was doing had a pure purpose at its core, his means were inexcusable. I just hope Kara doesn't go quite THAT far with Amber... So far her means are terrible, but not yet crossing the line to inexcusable. And we've already had a Leto-style character in the person of Mr. Calvin. Formerly good man, corrupted by the power he wielded, crossed the line to inexcusable means even while in his mind working towards pure purpose.