The appeal to the intellectually insecure is also more important than it might seem. Because economics touches so much of life, everyone wants to have an opinion. Yet the kind of economics covered in the textbooks is a technical subject that many people find hard to follow. How reassuring, then, to be told that it is all irrelevant -- that all you really need to know are a few simple ideas! Quite a few supply-siders have created for themselves a wonderful alternative intellectual history in which John Maynard Keynes was a fraud, Paul Samuelson and even Milton Friedman are fools, and the true line of deep economic thought runs from Adam Smith through obscure turn-of-the-century Austrians straight to them.
[W]hat possible purpose does this lashing-out serve? Will activists be shamed into recovering their previous enthusiasm? Will Republicans stop their vicious attacks because Obama is lashing out to his left? It was pure self-indulgence; even if he feels aggrieved, he has to judge his words by their usefulness, not by his desire to vent. This isn't about him.