Originally Posted by
BeerMug Paladin
I've always figured it was partly an ego thing and partly a fear thing.
Truly copy a human or an AI character that passes as human-level, and you can show they're not irreplaceable. Not unique. Trivial. You have demonstrated that there's some precise method to build a being that is "human". We know everything there is to know about consciousness and the human mind, and it's all physical processes. "We" as in, you know, the people in the fictional universe.
People prefer to have their self-worth and their preconceptions about reality verified. Both in day-to-day life and in their fantasies. To show things as otherwise might have fridge horror implications and I think authors tend to avoid such domains if it is not intentional. This is something that lurks under the surface of that idea, and I think it makes some people uncomfortable to consider the notion.
Fear of the cosmic variety is the reason, in other words.