Under US law, there is very little a publisher can be charged with, thanks to the first amendment. In this particular case, they may attempt to invoke the Espionage Act of 1917, but it may prove difficult as the goods which were "liberated" were not actually physically stolen--just copied in digital format rendering the original copies still perfectly usable. The goods were also classified as intellectual property, rather than physical property.
The individual responsible for the leak has been arrested and charged under the maximum force under the law, and has been in custody since July. His life is probably over at this point. The courts are looking at a jail sentence of upwards of 50 years.
On one hand, it's a little disconcerting to have confidential information floating out in the public eye which wasn't meant to be public. On the other hand, it informs voters on what's actually happening off-camera. Obviously, some politicians have been severely embarrassed by this, while others have not. If you notice, some of the ones who have been thoroughly embarrassed seem to be leading this "witch-hunt".
A lot of people in the US don't trust the government and their selective (or no) disclosure policies, especially about important national issues. This offers a peak behind the curtain.
Then again, there are security issues to consider--keeping operations safe, personnel safe, citizens safe, and allies safe.
Bottom line is that nobody's really sure what to do about this--it's really the first situation of its kind. In some ways it's good, in many ways it's not. Granted, there have been leaks on specific matters in the past, but the scale and the amount of material available is certainly unprecedented.