Because the witness’s identity is relevant to the evaluation of their testimony, and a trial is about finding facts definitively enough to assess guilt publicly. There’s a constitutional right to confront witnesses against you at trial – cross-examine them and challenge their testimony. If their identities were kept secret, that would be impossible.
Because that person/documents might hold information that could hurt the country or NATO or the world safety.
You witnessing a murder is on a whole different scale hence why there’s different classification for documents (protected,classified,secret,top secret, cosmic, etc).
Also depending on the country, you’re fully allowed by law to know who testify against you, hence why the witness protection program starts AFTER the trial (new identity,etc).
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