Whistleblowing organizations like WikiLeaks and accused hacktivists like Hammond are not foreign spies lusting to plunder intellectual property from U.S. corporations and government agencies in order to profit and gain a competitive advantage.
The FBI and DoJ are targeting high-level U.S. officials in hopes of learning who released classified information about Stuxnet to the press. What the government is not doing is publicly explaining why it launched Stuxnet.