The fallacies that create left-wingers and right-wingers

An amazing find. One of my favorite authors ever, Satoshi Kanazawa has this piece explaining the morallistic and naturalistic fallacies. They explain the irrational behaviour of both extreme leftists (marxists, feminists, political correctness crowd) and extreme rightists (super conservative religious nuts, people who like to go back to the 18th century rules)…

In short, here’s what the two fallacies are:

Two logical fallacies that we must avoid | Psychology Today

The naturalistic fallacy, which was coined by the English philosopher George Edward Moore in the early 20th century though first identified much earlier by the Scottish philosopher David Hume, is the leap from is to ought – that is, the tendency to believe that what is natural is good; that what is, ought to be. For example, one might commit the error of the naturalist fallacy and say, “Because people are genetically different and endowed with different innate abilities and talents, they ought to be treated differently.” 

The moralistic fallacy, coined by the Harvard microbiologist Bernard Davis in the 1970s, is the opposite of the naturalistic fallacy. It refers to the leap from ought to is, the claim that the way things should be is the way they are. This is the tendency to believe that what is good is natural; that what ought to be, is. For example, one might commit the error of the moralistic fallacy and say, “Because everybody ought to be treated equally, there are no innate genetic differences between people.” The science writer extraordinaire Matt Ridley calls it the reverse naturalistic fallacy.

And here’s a practical example I like:

Both are logical fallacies, and they get in the way of progress in science in general, and in evolutionary psychology in particular. However, as Ridley astutely points out, political conservatives are more likely to commit the naturalistic fallacy (“Nature designed men to be competitive and women to be nurturing, so women ought to stay home to take care of the children and leave politics to men”), while political liberals are equally likely to commit the moralistic fallacy (“The Western liberal democratic principles hold that men and women ought to be treated equally under the law, and therefore men and women are biologically identical and any study that demonstrates otherwise is a priori false”). 

Since academics, and social scientists in particular, are overwhelmingly left-wing liberals, the moralistic fallacy has been a much greater problem in academic discussions of evolutionary psychology than the naturalistic fallacy. Most academics are above committing the naturalistic fallacy, but they are not above committing the moralistic fallacy. The social scientists’ stubborn refusal to accept sex and race differences in behavior, temperament, and cognitive abilities, and their tendency to be blind to the empirical reality of stereotypes, reflect their moralistic fallacy driven by their liberal political convictions.