Historian: Anyone who thinks that the terrors of the ancient regime of Q were exclusively the work of fanatics is overlooking a basic truth: the regime was made up primarily of ordinary people enthusiastically seeking paradise. The regime executed many people in pursuit of its goal; but it later became clear that paradise, as they defined it, is unrealizable. So at least some of the ordinary people of Q were in fact murderers. Which one of the following principles, if valid, provides the most support for the historian's argumentation? ['The pursuit of paradise does not justify murder.', 'The pursuit of paradise justifies fanaticism.', 'Execution in pursuit of what is later found to be unattainable constitutes murder.', 'Enthusiasm in pursuit of what is eventually found to be unattainable constitutes fanaticism.']