In other words, the "rational" rejection of religion in particular and tradition in general facilitated an absurd leap into what amounts to romantic irrationalism. Since there is no legitimate authority, each person become a law unto himself: do your own thing, and all that.
For example, marriage is better then living together? Prove it. A fetus is a human being? Prove it. Beethoven is better than rap? Prove it. Heterosexuality is preferable to homosexuality? Prove it. Men and women are fundamentally different? Prove it. One is obligated to tell the truth? Prove it. Etc., etc. In each case, the moral truth is accessible to human beings, but not through the application of mere reason.
Slavery is freedom, lies are truth, amorality is morality. Memo to old Europe: a civilization not in contact with the Real will eventually perish. As it should. To put it another way, dying on the vine is a possibility, but dying off of it is a certainty.