Consequently, your Red Woman receives a wish from the Lord of Light who wants King's Landing to be set ablaze. You comply to his demand and as a result, thousands of fanatical adherents of R'hllor rally to the city and immolate tens of thousands of inhabitants. R'hllor rewards you with a good number of Shadows which are ready at your service anytime to eliminate your enemies, but at a costly price. You know what the price is? Your most important allies, such as the honourable Eddard Stark and his vassals, Lord Hoster Tully and his bannermen from The Riverlands and even me and my liege lords of the Vale are beyond appalled by your massacre, hence we all defect to House Baratheon of Storm's End.
Long live the only true King of the Seven Kingdoms, Renly of the House Baratheon, First of His Name, King of the Andals and the First Men, Lord of the Seven Kingdoms, and Protector of the Realm.
Oh, I'm receiving a visit from the High Septon of King's Landing who miraculously escaped the turmoil in the city. I am going to consult him on a possible Crusade in the name of the Seven against this alien religion you brought to our lands which will only result in mayhem and devastation. To make matters worse for you, I am also going to meet with Lord Tywin Lannister to negotiate on a temporary ceasefire so that worshippers of the seven-faced god from the Westerlands can smoothly join the Crusade as well.