Then its still just as barbaric and morally bankrupt, it still shows her for the cruel nut that she is, but it feels a bit more attached to her long-established thirst for power, revenge, etc...not just "oh her brain apparently malfunctioned"

And then you can incorporate her mental illness into it all by her *thinking* she keeps seeing Cersei on another street over and over again, so she keeps torching everything chasing a hallucination, and willing to sacrifice humanity for her selfish mission, meanwhile Cersei has already escaped/died.