I think a good example of defeating the villain and not actually making things better can be seen in many of the Arab Spring revolutions, especially Egypt. It was the most stable country in the Middle East for decades, though it was ruled by a dictator. Egypt got rid of Mubarak, but the movement that did it had no kind of coherent plan for how they were going to create a stable democracy afterward. And now Egypt is a decidedly worse place to live than when Mubarak was in charge.