What is the theme in The Pigman by Paul Zindel?

One main theme in the novel, The Pigman, is that of consequences. Consequences for our actions, and the consequences innocent people pay for our actions. In context, John and Lorraine's actions are thoughtless, immature, and selfish. Mr. Pignati pays for their thoughtlessness with his life. John and Lorraine, each to a different degree, will be left with the guilt.