Probably to drag their nets through the water and see what turns up or away. If the govt announces these attack threats and they are just made up, it could still be very useful psyops. Should the govt get lucky and announce a guess that is coinicidentally accurate it'll make the enemy skittish and paranoid and in the mood for killing potential leakers. Which will in turn tear them apart. All the while being hunted daily by CIA informants, Deltas and the rest. I love it.
Those were my thoughts as well. Unfortunately, some liberal-types around here seem to think they themselves are being set up as the intended victims by their own government. We can only speculate as to the reasons for their apparent personal problems and paranoia.