In most movies today, the audience is left to come to its own conclusions about the movie’s message. People are allowed to think for themselves, analyze, and interpret the movie however they want; very thought-provoking and controversial movies are often celebrated. I believe the introduction text added at the behest of the Hays’ Office was an attempt to try to control what the audience took from the movie, because censors at the time were afraid of what people might think of it themselves. Such violent gangster movies were just getting their start, and I think that the people in charge were afraid of what impact this new type of movie might have on society. There was probably an increased desire to portray organized crime in a negative light (as something that should be an outrage) because so many people were suffering in poverty during the 1930s; a rich and glamorous gangster life might seem appealing to the masses.
Really, the intro reads like propaganda to me. It tries to stir up negative emotions against organized crime, and tells people how they should think. I can understand why they might have included this text at the time. However, I still am not quite sure it was neccessary because it seems obvious to me throughout the movie (even without that text) that the gangster life isn’t all fun; it has a dark side and many negative consequences, too. I guess they really wanted to drill the message into people’s heads, though, and not leave the audience’s ability to grasp that to chance.