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In the novel they took the movie from, it's because the generation of aliens which prepared the invasion had no memory of pathogens faced by their ancestors. They were completely eradicated in their own world. So they had no understanding of infections.
Jackaloftheazuresand · 26-30, M
@Miram so they were actually bad at recording history
Miram · 31-35, F
@Jackaloftheazuresand Those before them, yes. Did you enjoy the movie?
Jackaloftheazuresand · 26-30, M
@Miram it's okay, nothing special