I think they are hurtful insofar as these immortality fantasies stop people from dealing with death in a less deluded way.
But, on the other hand, many technology/science/Math visionaries have been driven by mythic kind of visions. Newton, Swedenberg, Cantor and Bohm come to mind. That in itself isn't hurtful. But when the nature of the belief causes them to not deal with a major facet of human existence, it starts to be bad.
But, on the other hand, many technology/science/Math visionaries have been driven by mythic kind of visions. Newton, Swedenberg, Cantor and Bohm come to mind. That in itself isn't hurtful. But when the nature of the belief causes them to not deal with a major facet of human existence, it starts to be bad.