Tywin Lannister is a total FAILmachine for sending Gregor Clegane into the Riverlands instead of using Tyrion’s capture as a golden opportunity to discredit his political rivals: discuss.

Yep – and he compounds it with the ludicrously stupid idea to openly attack a party carrying the king’s banner and letting survivors get away. Indeed, as I’ve argued, only Deus Ex Machina prevented Tywin from being publicly proclaimed a traitor, rebel, and outlaw. Which means that at least one one occasion, Eddard Stark was a better politician than Tywin Lannister.