You killed him by mistake, with your stupidity
Every last sparrow will die before Margaery Tyrell walks down that street
I killed your High Sparrow and all his little sparrows. All his septons, all his septas, all his filthy soldiers, because it felt good to watch them burn
I pushed a boy out a tower window, crippled him for life for Cersei. I strangled my cousin with my own hands just to get back to Cersei. I would have murdered every man, woman and child in Riverrun for Cersei.