“That is extremely unlikely. If every person retained the ideas of his parents, there would never be any change. For example, we would still live in a society that believes fornication is wrong. We do not. We would live in a society that believes homosexual activity is wrong. We do not.”
Yes and no.
Fornication and homosexuals have always been with us. Just now it’s being ramroded down our throats. We still don’t accept it as normal. Just those who always have want to force it upon the rest of us so they don’t feel like perverts.
While it's true that we (you and I) do not consider fornication and homosexuality to be moral, a very significant percentage of our fellow citizens does.
In the case of homosexual activity, I don't think that an absolute majority of the population finds it acceptable. However, an overwhelming majority of the population, including the FR sample, does not believe fornication is wrong.
These are massive changes in beliefs over the past 60 years, and they cannot be attributed to the greater reproductive success of sexual libertines. Most people have converted from the traditional religion of Christianity to the new religion of untrammeled sexual gratification.