[Hawk]

Originally Posted by Amnorix

Spoiler!

They both cheated, so they had that going for both of them. But one of them birthed false heirs, which led to murder of Jon Arryn, then murder of the king, the beheading of Ned, the insanity of Joffrey, and into the morass that is A Song of Fire and Ice.

Not to forgive Robert, but he didn't cause all that, except to the extent that his lack of ability to be affectionate toward Cercei perhaps drove her back into Jaime's arms.

Spoiler!

Actually, Jon Arryn was murdered by Lysa at Littlefinger's direction, and he also had her falsely accuse the Lannisters, all of which started the whole mess between the Starks and Lannisters. Littlefinger was the ultimate evil mastermind behind it all as revealed by Lysa in the books and in the show right before Littlefinger kills Lysa.