Several months ago an officer of my guild went full tantrum. He quit the guild and convince at least of 10 of the core raiders to leave with him in the middle of the patch.
They formed a new guild and give officer rank to everyone with the tantrum maker being the guild master , they all left saying they will progress even more (in the raid) without the rest of us. Then the one that made the tantrum quit the game and the new guild didnt survive a month after it was created and everybody that followed him ended up in diferent guilds.