There are risks with unrestricted trade among nations, whether losing key military industries, accepting pathogens and pests across borders, or penetration by terrorists and spies. You wish to socialize those risks while privatizing the benefits.
That's fascism.
From W. Cleon Skousen's famous list of communist goals (with thanks to FReeper forest):
4. Permit free trade between all nations regardless of Communist affiliation and regardless of whether or not items could be used for war.
Industries essential to national security must be protected. Even Milton Friedman understood. As for pathogens, pests, terrorists, and spies, I’d like to see you explain how placing tariffs on them helps.