This account reminds me of a scripture, bear with me:
19
"But a certain man was rich, and he used to deck himself with purple and linen, enjoying himself from day to day with magnificence.
20 But a certain beggar named Laz´a·rus used to be put at his gate, full of ulcers
21 and desiring to be filled with the things dropping from the table of the rich man. Yes, too, the dogs would come and lick his ulcers.
22 Now in course of time the beggar died and he was carried off by the angels to the bosom [position] of Abraham. "Also, the rich man died and was buried.
23 And in Ha´des he lifted up his eyes, he existing in torments, and he saw Abraham afar off and Laz´a·rus in the bosom [position] with him.
24 So he called and said, ?Father Abraham, have mercy on me and send Laz´a·rus to dip the tip of his finger in water and cool my tongue, because I am in anguish in this blazing fire.?
25 But Abraham said, ?Child, remember that you received in full your good things in your lifetime, but Laz´a·rus correspondingly the injurious things. Now, however, he is having comfort here but you are in anguish.
26 And besides all these things, a great chasm has been fixed between us and YOU people, so that those wanting to go over from here to YOU people cannot, neither may people cross over from there to us.?
27 Then he said, ?In that event I ask you, father, to send him to the house of my father, 28 for I have five brothers, in order that he may give them a thorough witness, that they also should not get into this place of torment.? 29 But Abraham said, ?They have Moses and the Prophets; let them listen to these.? 30 Then he said, ?No, indeed, father Abraham, but if someone from the dead goes to them they will repent.? 31 But he said to him, ?If they do not listen to Moses and the Prophets, neither will they be persuaded if someone rises from the dead.?" LUKE 16:19-31
This might be a case of that even if someone from the dead returned to tell them, they still would not believe, because there is ample evidence about the UN situation, from the UN itself. But they will say that the UN people fabricated it.