Board Thread:Questions and Answers/@comment-66.169.249.103-20160529235556/@comment-5001176-20160530034742

To add on to what H-Man said, Littlefinger thrives on chaos, because the more he screws things up for everyone else, the more he can find ways to benefit from it. Basically, he's a more clever, even more devious version of Heath Ledger's Joker from ''The Dark Knight. And so far it's worked out well for him - he is the de facto ''Lord of the Vale, considering that Robin Arryn has the approximate intellectual development of the average toddler, making him easy for someone as clever as Littlefinger to manipulate. He has gotten away with arranging for the murder of both the Hand of the King(Jon Arryn) and the King himself(Joffrey), with literally no one living who can connect him to the former and only one person - Sansa - who might suspect his involvement in the latter.

So yeah.