Military secrets hidden in porn collection

Sometimes people are just too stupid for their own good. It seems that some officers in the Japanese defense forces decided that storing top secret documents in with their porn collections was a good idea. Those collections were later shared with other officers who did not have clearance for the classified information. No one noticed until later that the top secret documents were in the same folder with the porn.
There are so many things wrong with this situation.
Why in the world did they think that their porn collection was a good place to hide secret documents? If a hacker ever got a hold of one of those computers you can be sure they would at least look at the porn folders.
Why were the officers keeping their collections on military computers in the first place? Seems like your own personal documents and porn collections shouldn't be on government computers in the first place.
Why were the classified documents not encrypted in some way? Really, having them in the clear is a big security risk.
I would say that the Japanese military is obviously not very good at protecting secrets, but here in the US we seem to be just as stupid. It seems that the National Nuclear Security Agency whose job is to protect our nuclear secrets lost a whole bunch of its desktop computers recently.

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