We can then derive some thoughts from observation. Imagine disparate moral systems laid on a spectrum from lesser to higher. A hermit does not need a moral system. A loosely knit, individualistic, frontier society needs a lesser moral system because interpersonal relations are infrequent and low pressure. Without a sufficient moral system, society will tear itself apart.
Major cities provide a related analogy.
Cities with higher moral systems, like Singapore, function more effectively than cities with lesser moral systems, like Lagos. Similarly the military, a tightly knit, intense subgroup within the larger society, requires and maintains a higher moral standard. Because military life is higher pressure than civilian life, and because interactions between military personnel are more intense, military society requires a higher moral standard to maintain its integrity. Military societies which fail to maintain those standards become bandits or defeated. Basically the article asserts that a person may maintain different moral standards in different situations.