I wasn't speaking of all cases of is/ought. I was referring to the idea that virtuous jobs should be valuable jobs and vice versa -- that the system of production can be turned to produce according to a ranking function of virtue. Civil rights and suffrage aren't jobs or economic production; they're matters of custom and law, which Hayek also discusses as similar but distinct forms of spontaneous order.

You correctly pointed out that the value of labour has been affected by simple economic considerations more completely than any theory of the native goodness of honest toil.

Rand's cardboard aliens all seem very smug and self-assured and basically I think her books have done more harm than good.

Hayek's tone is an exasperated old school master. He just wants people to understand that you can't create -- as in design or ordain ab initio -- a working economic system that aligns to virtuous ends. It will break.