According to the laws of nature, when one is extremely opulent one becomes degraded, and this is true both individually and collectively.

… We are now actually seeing this in America. The entire American nation has tried to advance in material opulence without striving to produce ideal human beings. The result is that Americans are now regretting the wholesale criminality of American society and are wondering how America has become so lawless and unmanageable. As stated in Srimad-Bhagavatam (7.5.31), na te viduh svartha-gatim hi visnum: persons who are unenlightened do not know the aim of life, which is to return home, back to Godhead. Therefore, both individually and collectively, they try to enjoy so-called material comforts, and they become addicted to wine and women. The men produced in such a society are less than fourth class. They are the unwanted population known as varna-sankara, and as stated in Bhagavad-gita, an increase of varna-sankara population creates a hellish society. This is the society in which Americans now find themselves.

Fortunately, however, the Hare Krsna movement has come to America, and many fortunate young men are giving serious attention to this movement, which is creating ideal men of first-class character, men who completely refrain from meat-eating, illicit sex, intoxication and gambling. If the American people are serious about curbing the degraded criminal life of their nation, they must take to the Krsna consciousness movement and try to create the kind of human society advised in Bhagavad-gita (catur-varnyam maya srstam guna-karma-vibhagasah [Bg. 4.13]). They must divide their society into first-class men, second-class men, third-class men and fourth-class men. Since they are now creating only men who are less than fourth class, how can they avoid the dangers of a criminal society?

.. it is advised that the American people regret their mistaken advancement in civilization. They should take advice from the spiritual master, the representative of Krsna. If they do so, they will be happy, and theirs will be an ideal nation to lead the entire world.

From Srila Prabhupada’s purport to SB 6.7.12