B. Decay of morals in 20th century. Abandonment of absolutes. A. Absolutes are old-fashioned. It is arrogant to say you have the truth.
Life is complex - there are no simple answers.
Principle has crept into many ethical systems. Joseph Fletcher is a key proponent. Give me a case. Describe a real situation. Or perhaps somebody will ask if a man should ever lie to his wife, or desert his family, or fail to report some income in his tax return.