Mort Weisinger was the editor on Superman comics from 1941 to 1970, his tenure briefly interrupted by military service. Siegel and his fellow writers had developed the character with little thought of building a coherent mythology, but as the number of Superman titles and the pool of writers grew, Weisinger demanded a more disciplined approach.  Weisinger assigned story ideas, and the logic of Superman's powers, his origin, the locales, and his relationships with his growing cast of supporting characters were carefully planned. Elements such as Bizarro , Supergirl , the Phantom Zone , alternate varieties of kryptonite , robot doppelgangers , and Krypto were introduced. The complicated universe built under Weisinger was beguiling to devoted readers, but alienating to casuals.  Weisinger favored lighthearted stories over serious drama, and avoided sensitive subjects such as the Vietnam War and the Civil Rights Movement , because he feared his right-wing views would alienate his writing staff and readers.  Weisinger also introduced letters columns in 1958 to encourage feedback and build intimacy with readers.  Superman was the best-selling comic book character of the 1960s.  
Photographs and essays and novels and the rest can change your life; they are dangerous. Art shapes the world. I know many people who found a book that determined what they would do with their life or saved their life. Books aren’t life preservers; there are more complex, less urgent reasons to read them, including pleasure, and pleasure matters. Danto describes the worldview of those who assert there is an apartheid system between art and life: “But the concept of art interposes between life and literature a very tough membrane, which insures the incapacity of the artist to inflict moral harm so long as it is recognized that what he is doing is art.” His point is that art can inflict moral harm and often does, just as other books do good. Danto references the totalitarian regimes whose officials recognized very clearly that art can change the world and repressed the stuff that might.