>They will as a result probably avoid traveling to unfriendly jurisdictions without a diplomatic passport.
First of all, it's not like their individual identities would ever be known.
Second, they would already know that traveling to a hostile country is a great way to catch bullshit espionage charges, maybe end up tortured, and certainly be used as a political pawn.
Third, this is too sloppy to have originated from there anyways—however clever it was.
Sure, that’s possible. They will as a result probably avoid traveling to unfriendly jurisdictions without a diplomatic passport.