I believe that authors don't have a responsibility to include "messages" in their work, but they do have a responsibility to write a world that seems true and real, never more than when expecting readers to believe in magic and angels and fairies.
Cassandra ClareYou have something on your neck. What Looks like a bite mark, what were you doing out all night, anyway? Nothing. I went walking in the park. Tried to clear my head. And ran into a vampire What? No! I fell. On your neck?
Cassandra Clare