The second advantage claimed for naturalism is that it is equivalent to rationality, because it assumes a model of reality in which all events are in principle accessible to scientific investigation. ↗
Logan was talking about the Civil War, which claimed the lives of more than 500,000 Americans. He wanted to provide Civil War veterans with a day to pay respects to their fellow soldiers who did not live to see the end of the war, without losing a day's pay. ↗