The problems with these approaches, Hayek explains, are that they show no awareness that there might be limitations to our knowledge or reason in certain areas; they do not consider that part of science's task is to discover those limits; and they show no curiosity about how the extended order actually came into being, how it is maintained, and what might be the consequences of undermining or destroying those traditions which did create and do maintain it.
The connection between constructivist rationalism (the construction of morality from scratch) and socialist thought, Hayek argues, is that they both flow from conceiving order as arrangement and control on the basis of accumulation of all the facts. But, as Hayek earlier showed in his landmark 1945 essay, "The Use of Knowledge in Society", the extended order could not be such an order, for accumulation of all the requisite facts is simply impossible. Now he asserts that, similarly, the practices of traditional morality not only do not, but cannot, meet the requirements or criteria demanded by scientism. Hence they are necessarily "unreasonable" and "unscientific". Hayek insists, though, that this is not "news", for David Hume (1711-76) observed centuries ago that "the rules of morality are not the conclusions of our reason".
And this is not simply the case with traditional morals (including God, sex, family, and — particularly of interest to Hayek — private property, saving, exchange, honesty, truthfulness and contract), but "is also true of any possible moral code, including any that socialists might ever be able to come up with". Hence were we to pursue this perilous path — as "all versions of scientism have advised" — we would soon "be back at the level of the savage who trusts only his instincts". No argument about morals, therefore, can legitimately turn on the issue of scientific justification, because it cannot be achieved, so nothing can be gained-but everything can be lost.
Having established the limits of reason in a construction of morality, Hayek begins, however, to take a dubious turn. He asserts that "while our moral traditions cannot be constructed, justified or demonstrated in the way demanded, their processes of formation can be partially reconstructed, and in doing so we can to some degree understand the needs that they serve". He sees this as a historical or natural-historical investigation, resembling what followers of Hume called "conjectural history", and not as an attempt to construct, justify, or demonstrate the system itself.
Why would we want to engage in such "rational reconstruction?" Because doing so enables us "to improve and revise our moral traditions by remedying recognisable defects by piecemeal improvement based on immanent criticism, that is, by analysing the compatibility and consistency of their parts, and tinkering with the system accordingly".
On the face of it, this may appear uncontroversial: after all, all moral systems, whether utilitarian, Revealed, or other, are tinkered in this way. Indeed, tradition itself is largely the accumulation over the ages of the sort of gradual "adaptations to the unknown" that Hayek is describing. On such a reading, Hayek's enterprise is modest, and he is simply encouraging intellectual humility in the encounter with traditional morality.
But there is a pivotal difference between traditional moral tinkering and that which Hayek is suggesting: those traditional moral systems usually had Revelatory foundations and an associated telos which made the improvements philosophically coherent and intellectually rigorous. One wonders, then, what Hayek understands to be the source of traditional morality, the means by which morality can be tinkered with, and the end to which morality aims. Put differently, what is it, according to Hayek, that justifies traditional morality?


















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