[GSlob]

Well, for the sake of discussion, and as a rhetorical device, substitute the ports in question by more obvious national security enterprises of major importance - say, Lockheed Martin, Newport News shipyard, or Pantex plant [nuclear warheads]. Obviously, a proposition to cede control of such strategic assets would be a no-no.
This being the case, the principle of "protected enterprises" is unassailably true, and the only question remaining is where to draw the line.

[Mike Darancette]

Well, for the sake of discussion, and as a rhetorical device,

A logical fallacy is not a rhetorical device.