Sometimes, the showrunners decide to make changes to the source material that wind up making certain scenes and characters make no goddamn sense whatsoever.
While they're all fairly vague, it wouldn't be an article about "Game of Thrones" if we didn't analyze and read way too deeply into the characters who are pictured, their general state of being and why they all look so sad.
One underlying theme in Game of Thrones is the portrayal of people who are slightly different or people with special needs. And I say it’s about time that a highly successful series shows people of all ranges and abilities.