Because store bought eggs with cracks in them are more likely to carry salmonella and other bacteria. The shell and membrane are the egg’s lines of defense against contaminants. So if the shell is cracked bacteria can get inside it. And the longer a cracked egg sits there, the more time the bacteria has to breed like crazy. Which in turn can make us sick with food poisoning if we eat a contaminated egg. I hope this helps!
Edit: better word choice.
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