HAYEK COULDN'T ADMIT HE WAS WRONG

The Road to Serfdom (1944) was written to warn about the dire consequences of the Labour Party taking power in Britain after WW II and it was clearly wrong in its predictions.  In his 1956 preface, Hayek did not budge an inch from his claims:

Of couse, six years of socialist government in England have not produced anything resembling a totalitarian state. But those who argue that this has disproved the thesis of The Road to Serfdom have really missed one of its main points: that the most important change which extensive gtovernment control produces is a psychological change, an alteration in the character of the people. This is necessarily a slow affair, a process which extends not over a few years but perhaps over one or two generations.

Twenty years later in 1976, he still refused to admit that he was wrong.