no shit he's undercutting characters. IT'S WHAT HE DOES. He has made it clear before he wants everything. That means complete power. Chaos is a ladder, and he's trying to create that chaos.
Hey, maybe by your standards, Cersei will be completely reasonable next episode because hey, there's white walkers, no time for political machinations, amiright?
But no, the characters have their motivations and Littlefinger is still pursuing his goals like he always has. Regardless of your feelings.
Nah
breh
Nahhhh
He's not undercutting characters
The writers are undercutting characters to service a fairytale plot to him
The show gave us master assassin Arya. Unearned? Sure, I can meet someone halfway on that. But I know what a montage is, and I'm willing to go along with that. Sniff a few powders, fight a few blind fights, sure, whatever. She murders the number 2 and 3 Freys, and then the number 1 Frey, and then Freys 4 through 99? Okay, fine, that's the character.
The turn in all of this, the culmination of it all, is when Arya shirked revenge in King's Landing to go home to Winterfell and be with her family. This was the other half of the point of the House of Black and White storyline. Arya isn't no one. Arya is, and always will be Arya Stark. She has revenge at the tips of fingers, and she goes back to Winterfell instead.
Because she's Arya Stark.
Of course, when she gets back there, she immediately proves that she's neither a master (or even mediocre) assassin or loyal to the Stark name. Or smart at all, because she seems to believe that should Jon not come back, it would be better for the North to dissolve into 943 little fiefdoms than be united under and ruled by the demonstrably competent Sansa.
Not to mention the fact that she's completely unwilling to accept neither the fact that Sansa was a scared little girl at the Sept of Baelor nor that Sansa has grown as a person since then, through the hardships of real world experience.
It's not like they had a conversation in front of their father's grave about exactly that or anything.
The exact same shit goes for Sansa, who has told Jon not to trust Littlefinger, who told Arya and Bran to not trust Littlefinger because he's obviously dagger-scheming, who was about half a second away from telling Brienne to cut the head off the Littlefinger who saved her from the monsters that killed her family to sell her to the monsters who killed her family... who went and confided in Littlefinger at the first moment of strife, without any questions asked at all.
Sansa's entire storyline has been about her learning the game, and even her being brutalized when she overextends herself within it, which - like it or hate it - gave her the resolve to forego sentimentality and make shrewd decisions to allow her to rule effectively. And, you know, tell Arya to grow up when she reads that dumb, obvious letter.
But mostly it's been about her learning to not trust Littlefinger.
Which she does immediately.
Oh yeah, and she got rid of Brienne, because Brienne was the only person faithful to her herself while her vassals seem to continuously care only about their own self interest.
This is the foreward to a 10,000 page essay on all the character sabotage they did in this episode.
But I'm done writing because that shit gives me a fucking headache
Cersei being reasonable because of the White Walker threat next episode wouldn't be consistent with my standards, it'd be consistent with the standard they gave us this episode.