I am just wondering if you can back up your assertion that this is plethorically documented throughout the ages.
I fully admit my opinion is entirely anecdotal. I did grow up with 2 grandparents who were in their 20's during the 1920's. I can tell you that, in discussions I had with them, they felt like the late-40's into the late-50's were the golden era. They felt the 30's and 40's were simply destroyed by the depression and war. They told me the 20's were decadent and full of crime and general deceit. So from my 2 eye-witnesses (who grew up in different parts of the country, by the way, one in the north-east, one in the west), I would say that there was no general feeling that the roaring 20's were WAY better than the 50's. My most liberal grandfather believed that generally in that time between the war and the flower child days of the late-60's there was generally a more patriotic environment and people tended to act more with a sense of integrity than either before or after.
Obviously there has been, and always will be crime and bad people etc. But even the crime statistics, normalized for population, bear this out with significant increases from say 1960 to 2000. It has kind of leveled off over the past decade at roughly double the crime rate of 1960.
But I won't provide the link, since I am not sure if you would accept any evidence that might be contrary to your opinion.