Describe the "Vulnerability of Innocence" theme.
Since Billy is innocent, he is unable to comprehend evil, and therefore, unable to protect himself from it. Claggart hates Billy for no reason other than his innocence. Even though Billy kills Claggart, Claggart achieves victory over Billy in his own death. Claggart's actions cause Billy to fall from grace by committing murder, and Billy suffers death as a consequence.