I'm not sure why people think the Tyrells were scapegoating Sansa, except purely for jaded cynicism. Look, the Tyrells LIKE Sansa, legitimately. Straight up. The QoT and Margery have had several scenes with Sansa and there has been ZERO hint that they are double-crossing her. In fact there is an interview with Natalie Dormer where she explicitly says the Tyrells ARE NOT taking advantage of Sansa. I think people are simply to jaded by Lannister methodology. The Tyrells are not the Lannisters. They are a fusion of Lannisters+Starks. They are as crafty, clever and politically aware as the Lannisters, but still with a moral center of Duty and Justice like the Starks. Not as "good" as the Starks, but wayyyyy less evil than the Lannisters. The thing is: The Starks were too good. They were so "good" that they were blind to the reality of the world, and ultimately that is what defeated them. The Tyrells represent "as good as you can realistically be" in this world. The Tyrells don't want to "Muhahahah RULE!" They want to rule because they understand that they alone (at this point in history) have what it takes to actually (and justly) rule the Seven Kindgoms. Remember Olenna's comment last season about "squirting the milk back up the udder"? Everything's gone to pot, and Olenna realizes that if the Tyrells DON'T act to restore things, they are guilty by complicity. They recognize the danger. They don't want to be in this situation. They wish none of this had ever happened...Joffery, the war, the Starks, the famine, etc When they came to Kingslanding, they bid their time. They studied everyone. Gears were turning. They even called Sansa in to talk with her... because Sansa is a wildcard. It was VERY important they understood Sansa's motivation, and MOST importantly: Is Sansa a Power-player? They realized that NO she isn't and they repeatedly tested her on this to be sure. She's just an innocent daughter of a man that himself was too innocent to recognize the danger. They realize Sansa is in an EXTREMELY dangerous situation, and they decide that if they can, they will try to help her. Legitimately. But also, helping Sansa is not their primary purpose for being here and they won't sacrifice their main goal for her...nor should they...ending Joffery's rule and the war ARE more important than the life of one girl. So first Olenna tried to marry Sansa off to Loras. This would have been a "win-win" situation. Yes, the Tyrells would gain the "Keys to the North" but Sansa would get her fairytale story AND would be out of KL and out of the power-plays. I don't fault the Tyrells for gaining something in this arrangement. Arranged marriages are usually mutually beneficial, and the Tyrells weren't shafting the Starks. When that fell through, Olenna worked Sansa into the main plan of killing Joffery. Again not for a scapegoat, but for JUSTICE. Olenna explains her motives as she's taking the jewel from Sansa. Listen to Olenna talking. "What sort of monster kills a man at a wedding?" Notice she's condemming Joffery and also implicating herself. Joffery is a monster...but so is Olenna (for what she's about to do), and as Tyrion says: "Monsters Are Dangerous." Olenna thought the Lannister actions were so reprehinsible that the instrument of their destruction NEEDED to pass through Stark hands. But she isn't scapegoating Sansa because she's set up an escape plan for her. Olenna CARES about Sansa and is getting her out of this place, but only after justice is done. Notice several things: Tyrion is being followed. So is Bron. The Lannisters know about Shae (Sansa's handmaiden), very likely the Tyrells do too. But Dontos isn't the type the Lannisters respect or fear. They AREN'T watching him, and Olenna knows this. Olenna misdirected everyone with the bit about her handmaidens getting a good necklace ("Tell the who you are and tell them who I am") . Noone suspects anything. It just seems like she wanted a nice necklace for the wedding, but no doubt they brought back MANY necklaces for her to choose..(and modify.) Then Olenna plants a necklace on Sansa via Dontos (with no one noticing) and when events transpire, Dontos (apparently stone sober) shows up to save Sansa. The QoT is absolutely brilliant and has escalated the game to a whole new level and at the same time struck a much needed blow for the good guys AND escaped blame herself AND got Sansa out of Dodge. The ONLY bad thing that happened was that Tyrion got blamed, which was not her intent, but Tyrion is probably the best equipped to get out of the situation, certainly better equipped than Sansa.
