In the Pentagon Papers case the government asserted in the Supreme Court that the publication of the material was a threat to national security. It turned out it was not a threat to U.S. security. But even if it had been that doesn't mean that it couldn't be published.
You can't fall back on the private sector and say 'You take care of the nation's banking system.' That's a fundamental function of the government the Federal Reserve the Treasury and the FDIC etc. All of those agencies have a major role to play there.
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We all learn in school that the judicial legislative and executive branches of government must check and balance each other. But other non state institutions must participate in this important system of checks and balances as well. These checking institutions include the academy the media religious institutions and NGOs.