As the question says, why do we need to refrigerate something after it’s opened? I have a bottle of Chipotle Sauce I got from Target, and it was happily sitting in the shelves for who knows how long unrefrigerated. It says on the label to refrigerate after opening. Why? And I don’t think it’s because Target is air conditioned. Some bodegas in nyc for example are un air-conditioned and will sell similar stuff.
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You put something in an airtight container, and everything that needs air to live dies (I.e., most problematic bacteria).
You open said container, bacteria can now live inside it because it’s not airtight and is attracted to food because… it’s food.
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