Take corporate espionage: sure proprietary files from my employer could end up on hard-drive. But that would mean the FBI is willing to in addition to frame me, pay someone to go in and steal from my company. That's the type of thing that get's someone's boss's boss canned.

Do you see how high the conspiracy is going here? And do you know how messy this type of action gets when you need all these different nefarious actors executing FrontPageHeadline news if caught.

As far as the Drugs.xls, or the MobsterAccountPayable.xls, there already exists much legal room to disqualify a one-off document, without some kind of physical evidence - e.g. a guy wearing a wire says "Hears the money to pay Tony the Muscle" and you say "cool" or the guy who runs a storage facility says thats the guy who came in two months ago and rented that locker where the drugs were found. That's why the police are so obsessed with getting these type non-digital evidence: because a conviction on pure digital grounds is almost impossible with a halfway decent lawyer.

The thing about CP it doesn't have to be congruent with any other aspect of your life or be verified by anything physical or any witness. Even the motive/rationale is he had disturbing sexual impulses deep in his heart and its common sense that he wouldn't revel these to anyone so let's just assume he does.