That song is actually based around a short novel by an existentialist phillosopher named Camus, called The Stranger. In the Novel, a man's mother dies, and then by a series of events he shoots someone who had been harasing him and his friend (Mama, Just killed a man. Put a gun against his head, pulled my trigger now he's dead). The rest of the story is him being begged to convert to Christianity to secure a pardon, but refusing (Beelzebub has a devil put aside for me!), causing him to go to a trial where he is determined to be guilty of murder due to him not being upset at his mothers funeral.