I don’t deny that Europe learned a devastating lesson, in the 20th century. They didn’t realize that the more accurate formulation of, “if God does not exist, everything is permitted” was, “if God does not exist, everything is permitted, so long as you are willing to accept the consequences.” The people of Europe – and of the western world generally – were *not *willing to accept the consequences. All of these theories – Social Darwinism and eugenics, biologically-based racism, fascism and communism – led to too much death and suffering.
Even people living in Germany had a very visceral “do or die” experience-- either they enjoyed living in war for 6 years; enduring the loss of millions of lives, including – potentially – their own; or, they did not enjoy it. When they went to those rallies in Nuremberg, this is not what they thought they were signing up for. Those rallies never talked about the death and suffering of the German people, except in the euphemistic terms of “sacrifice.”
Same thing with Soviet Communism: either people enjoyed it – either it was what they wanted – or they didn’t. Most people realized they didn’t want it. They must not have wanted it, because a wall was erected to prevent them from leaving.
In that sense, I would argue that an understanding of the pragmatic reasons why international law and human rights – including individual rights – exist, is actually stronger than ever.
What is most vulnerable to a morality based primarily on pragmatism, however, is sexual morals (“make love, not war”). I think that’s obviously what we’re experiencing today. Our society is pretty rock solid about certain prohibitions – rape is condemned in the strongest of terms (more than ever, if that’s possible); violent crime; murder; the sexual abuse of children (more than ever, if that’s possible). Rape and pedophilia are sexual crimes that are abhorred because they are violent or abusive in nature.
But a prohibition against homosexuality, pre-marital sex, artificial birth control suddenly don’t make as much sense, based on a purely pragmatic morality of “do no harm.” For many people, the supposed harm that homosexuality constitutes has not been demonstrated, and – if it does not harm others – they see no reason to prohibit it.