This is how the black comedy works:

• Many characters exist in an organization. Someone explains the rules and logic by which the system operates in great detail.
• Many of these characters, including the hero, go after a negative goal that involves killing someone or destroying something.
• Each believes strongly in the goal and thinks what he is doing makes complete sense. In fact, it is totally illogical.

This is a short extract from the section on Black Comedy from John Truby’s brilliant book – Anatomy of Story  (p135)