Remember when Arya plunged the dagger into the Night King, and we thought the existential evil was banished from the metaphorical world? Turns out, evil more than survived.
In retrospect, maybe we should have known. Maybe, when Daenerys looked haggard and vacant as she turned her back on Tyrion and gazed out the window, we should have known that she might snap. Maybe, when she threatened Tyrion with execution if he made one more mistake, or when she told Jon if she couldn’t have love, she would settle for fear. Or when she gave the “ends justify the means” speech stating that innocent peasants of the present may have to die to forge a better life for those of the future.