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It was not about science, indeed. The Shelleys were atheists, how "they" would wrote a story abotu "life should de only created by God". It is about giving birht and responsability over the kid. They knew Rousseau well, because he used to stay at Mary's house when in England.
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I learned that a cautionary tale is a tale told in folklore, to warn its hearer of danger. With Frankenstein, I believe the warning Shelley was trying to warn about is life being created from technology and not from God. There are many examples that show this being true in modern science such as cloning, artificial insemination, and even artificial wombs (which I just recently learned about myself) . She is trying to warn about the dangers of "playing God" and the dangers that modern science is doing today. I'm not very religious myself but this is the sort of vibe I'm getting from the story that can relate to a cautionary tale on science from what I have read so far and from the knowledge I have about the story before reading.