My guess is that there's nothing quite that specific in our evolutionary past. But rather, if you're looking for an evolutionary explanation, you might say that most organisms are neo-phobic -- that is, they're a little scared of stuff that's new and different.
私達の進化の過去において 特別な事は 何もなかったと私は思います ただ― 進化論上の説明を探せば ほとんどの生物は新規性恐怖症―つまり新しく 異質なものをちょっと怖がる という事が言えるかもしれません