I think that Esther, as Klaus said in the previous episode, is the real monster. She let Mikael abuse Klaus for years and she didn't do anything about it (well, she gave Klaus the necklace that weakened him), she turned her children into vampires without thinking about the consequences, she tried to kill them, she tried to kill Klaus's baby, and now she is going to destroy everything they hold dear so they beg her "to release them from their pain". She is a monster and she is completely crazy.