re: Crackpot ASOIAF Theories SPOILERS

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It all went to shite when his reason and intellect bailed out of King's Landing. He saw the writing on the wall.

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Yep, honestly he could see that with Cersei when Robert died. I think he was absolutely appauled by the stupid decisions she and her son made, like killing Ned (not Cersei's idea, but you can guarantee Joffrey wouldn't have been able to go through with it if Tywin was there), giving scumbag brownnoser Janos Slynt the largest fortress in Westeros, and dismissing the most beloved knight in all of Westeros who could help any of the rouge kings in favor of a rabid dog. That was just a taste of what would come when Tywin didn't have at least someone standing in Cersei's way of absolute power, even if it meant giving it to the person Tywin Lannister despised most in Tyrion Lannister.