Oxymoron

In the poem "London" by William Blake, an oxymoron is used to help the author make a point. The author is showing sympathy to a prostitute rather than placing blame on her. The author shows that the setting is miserable, and there may be nothing else to do for money. The oxymoron is "Marraige hearse." This phrase is adding to the effect that people are in pain and dying. Royalty is not paying attention to these people, and the soldiers are turning their backs. All the social classes in society are being affected by these hardships. People are miserable and everyone seems to be crying.