Quoth Sidney Hook (Quoted in turn by Corey Robin)
The extraordinary virtues Miss Rand finds in the law that A is A suggests that she is unaware that logical principles by themselves can test only consistency. They cannot establish truth….
This is something that needs to be drilled in the minds of all right-libertarians who insist that they can describe reality without requiring any empiricism at all. From the “A is A” Randroids to the “Human Action” Misoids.