I agree and try to correct myself. A sign has to do with truth. Your post seems to me as a generalization of Karl Otto Apel´s "Letztbegründung der Diskursethik" (Final foundation of discourse ethics?) from human discourse towards communications, signs, in general. But with this point and the way you put it, each and every sign is connected to truth somehow, and there cannot be a distinction between perfect and imperfect signs. If truth is being looked for by every sign, but achieved by none, who could justifiedly assign a perfection value to a sign, or define a perfection scale for signs?
One more complication: If the sign is a lie, then the final interpretant is a lie too, not the truth. Except one might say: It is the truth that this lie is put up, or: It is the truth that people believe in this sign or are influenced by it. But you hardly can say, that the sign is perfect or true. Maybe in his time, Karl Otto Apel could not foresee how bold and unscrupulous people today design alternative facts and forge signs of them. But these signs are rid of (regulative) hope, thank you for this term, and I think it is justified to hope, that in a false sign the absence of regulative hope is easily detectable.
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