All her life Cersei has been a thing used by other people. She never mattered. She was marriage-material to be traded for alliances. She was a mare to be bred. Her opinions and feelings about her life didn’t matter.
The most poignant example of this is during the battle for King’s Landing, when Cersei, Sansa, and the other royal ladies are sheltered in an inner room while the fighting goes on outside. Cersei lets Sansa know that the executioner isn’t there to protect them. He’s there to kill them all should the city fall, because it is more merciful for them to suffer a quick death than to be slowly raped to death in the sack of the city.
The one thing the world has said over and over to her is that unless she has absolutely power, she has none at all. Even as the wife of the King, she is a thing foremost.
And then the High Sparrow really brings this home with the torture, degradation, and ultimately the public humiliation of the Shame! scene. All the while no one came to save her, because she was being weighed for her usefulness. Her safety and dignity were being traded around like so many pounds of wheat.
She’s decided this will never happen again. She’ll take any steps to prevent it. I love that.
I’ve seen this type of anti-hero before. Most recently, Syenite of The Fifth Season. I love that character as well, for the same reason. There comes a point where you’d rather see the entire world destroyed than condemn yourself to such an existence. Where you’d rather kill your own child than let them live such a life. Where you no longer care who dies, because everyone, EVERYONE was fucking complicit.
So I understand why, for Cersei, remaining in power is more important than saving Westeros. If either the undead or the humans are destroyed at Winterfell, but the opposing side is weakened enough that Cersei’s army can destroy what’s left and secure the continent under her rule, that is ideal. Humanity gets to continue to exist, all her enemies are dead, and she will never be used like a thing again. There is the possibility that the undead will win and destroy all life on Westeros, yes. But that is preferable to returning to life as chattel. If humanity has such a problem with extinction, maybe it shouldn’t have made life a living hell for so many.
Not that I agree with this, of course. I’m very pro-humanity. It’s just that this type of character speaks to me on such a deep emotional level that I can’t help but feel every single ounce of rage and despair with them. <3