What leads you to believe that access to search these datasets is some sort of unregulated, unmonitored free-for-all for anyone allowed to wander into an intelligence agency building?
The scenarios you invented sound very far-fetched to me, if these did happen I very much doubt the perpetrator would be able to get away with it.
> At least a dozen U.S. National Security Agency employees have been caught using secret government surveillance tools to spy on the emails or phone calls of their current or former spouses and lovers in the past decade, according to the intelligence agency’s internal watchdog.
The scenarios you invented sound very far-fetched to me, if these did happen I very much doubt the perpetrator would be able to get away with it.