Sure, at some level scientists know nanobots will destroy mankind. They just can't resist seeing how it happens.
Humour
In 1800s Paris, women were prohibited from studying the nude human form, because this would've ruined the wedding-night surprise. (Surprise! It's a penis.)
Humor, Books
The story was so thoroughly believed that a Springfield, Massachusetts, missionary society resolved to send missionaries to the moon to convert and civilize the bat-men, apparently unaware that bat-men have lost all faith since they saw their parents gunned down in that alleyway.
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