WikiLeaks is in its essence just a Wiki site. A web site. It's clear that publishing text is in no way unique to that site, you can do it on any site. Hopefully the government isn't saying that free communication is the real threat to national security.
WikiLeaks didn't commit any of the acts in the leaked documents, it wasn't their job or responsibility for keeping those documents secret, and they didn't leak the documents from their origin: some unknown source did on their own will, and sent them to WikiLeaks.
All WikiLeaks did was take those documents, make a cursory check of authenticity, and publish them.
Of course, by doing so, they become an easy target for people who are willing to turn heads away from the actual problems that lead to projects like WikiLeaks, and instead blame the messenger.
The real problem (for certain people) is that WikiLeaks is now a vivid symbol nurturing an environment where people may not simply do something because it was ordered from above, and especially if it's in conflict with basic human rights and morals.
But by loudly blaming WikiLeaks for the created situation, they only serve to further strengthen the very symbol they want to destroy. Somewhat ironic. As long as WikiLeaks is on everyone's target, and not their anonymous sources, more and more whistle-blowers will choose to trust them with their data.