You are not identifying what the Lesson of the Parable would be with this kind of rhetoric.
The "ah ha" moment of the Parable was...
"If they don't believe Moses and the Prophets ABOUT THE PLACE OF TORMENT that awaits the wicked dead, then they won't believe it if a dead man comes back and tells them about the PLACE OF TORMENT"
That is the text and that is the Lesson of the parable,
the "moral" or
the "truth" as you call it. The part that any child could underline and identify in his school lesson on "what is the moral of this parable"
Any other answer the child gave would be marked wrong. Only the part I have highlighted can be the correct LESSON of the parable.
27And he said, ‘Then I beg you, father, to send him to my father’s house—
28for I have five brothers—
so that he may warn them, lest they also come into this place of torment.’
29But Abraham said,
‘They have Moses and the Prophets; let them hear them.’ (Hear them about what? That which the rich man wanted to warn them about THIS PLACE OF TORMENT.) 30And he said, ‘No, father Abraham, but if someone goes to them from the dead,
(goes to them from the dead to say what? vs 28.. to warn them about this place of torment) they will repent.’
31He said to him,
‘If they do not hear Moses and the Prophets, (Hear Moses and the Prophets say what? Warn them about a place of torment that awaits the wicked dead) neither will they be convinced if someone should rise from the dead.’”
So now you must concede that the LESSON of the Parable is not that of it being a Parable, (being a Parable is not the Lesson) You say that it teaches a truth, and then you say that the truth it teaches is that their ideas of the dead are false? That is not the lesson of the parable. No child who said that would pass his school lesson on how to read a parable. The Lesson is as I have stated it and you must concede to that. At the very least you must concede that he has stated from this parable that Moses and the Prophets warn of a place of torment that one can avoid if they believe Moses and the Prophets whereas supernatural visits from dead people would not convince them if they are not convinced by Moses and the Prophets.