I'm no intelligence expert, but I'd be surprised if the NSA would expect something like this to find a "smoking gun" proving that person X is planning Y.
More likely you already have suspects, and your suspects have acquaintances , family etc.
You would be more interested in looking at these people, who do they network with on social media, what are they interested in?
Might they be knowingly or unknowingly be providing material support?
You would probably use this information to build up a broader profile and see which avenues are worth investigation.
I doubt that is something to be much concerned about, as I doubt there would be much use of anything that produces lists of suspects without explanation. What would one do with such a list? It would be like getting a bunch of anonymous tips all saying that a different person did the deed, without any clues to follow up on.
Getting a list of suspects is rarely a problem for law enforcement; the difficulty is in winnowing it down to the actual culprits. When a body is found, for example, family and acquaintances are all initially suspects, and experience has shown that summarily dismissing any of them, merely on intuitive grounds, will eliminate some fraction of actual culprits.
If a system did start suspecting the actual culprits with a significantly higher success rate than people achieve, there would be much reason to reverse-engineer the process in order to figure out how this was accomplished, as doing so would provide clues (and, ultimately, evidence) that otherwise could only be found by an independent process.
This assumes that due process exists, such that unsupported accusations are not taken as evidence, but if due process has been abandoned, we would have a much greater problem than that posited here.
Then I would simply employ it as a means to get the names of those who deserve further investigation. The further investigation is putting a live person on the other side and then nailing the pervs.
You question them, ask if they saw anything unusual, ask if they saw anybody matching a suspect's description, spot a known perp, spot somebody staking out the place hours before the crime...
I'm thinking just about detection at this point. Knowing specifically what's going on and who is doing it would be an important first step towards any subsequent policing or political action.
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