A lot of threat models that the USA defends against are perfectly legitimate, because the USA has used them against opponents in the past! e.g. US military and embassies always fly in new equipment from the USA, rather than buying local. Why? Because in the cold war, the Soviets got a local photocopier and local repairmen. The USA had a camera in it and the repairman was a spy. These aren't theoretical attacks to the USA.