Look, it's more of a computer and systems issue than protecting innocent minds from classified spillage. If someone, on an unclassified US government computer, downloads a classified document, then the computer has to be sanitized. The stress on the IT staff would be enormous, and the exposure of the unclass network to classified would result in security violations. Yes, one might say that hey, it's out in public, why is it classified? Because the process of declassification does not include "because it's out in public". Just because something is exposed doesn't mean it's suddenly unclassified material; the reasons for classification still apply, and the expiration of that information (by default 10 years from production) still applies. This isn't anything I expect people who haven't worked in a classified environment to automatically know, and clearly, the press has no clue.
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