The paper demonstrates a close relationship of post-truth to pragmatic truth as William James put it. As such post-truth cannot be treated—as it is commonly perceived— as a falsehood in the sense given it by the classical idea of truth. Post-truth is not a classical cognitive value, but a means of action, more concretely, a means of realizing interests of its operator by using the method of cognitive camouflage; it means that post-truth is disguised as a truth in its classical (correspondence) sense, but it only seemingly communicates in the objective way (i.e., impartially and nonsubjectively) real facts. In my view, the present eruption of post-truths is an effect of the spreading of the pragmatic system of values and infecting by it the whole public sphere and, in consequence, also individual principles and norms of action.