Science fiction has its own history its own legacy of what's been done what's been superseded what's so much part of the furniture it's practically part of the fabric now what's become no more than a joke… and so on. It's just plain foolish as well as comically arrogant to ignore all this to fail to do the most basic research.
I think a lot of people are frightened of technology and frightened of change and the way to deal with something you're frightened of is to make fun of it. That's why science fiction fans are dismissed as geeks and nerds.
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But because we live in an age of science we have a preoccupation with corroborating our myths.