Is there justification for tariffs?
The above arguments are all valid. But we must consider that the stable global world order of the last 70 years is shifting. We are no longer in a time of continued world population growth, with commensurate continuing growth in demand. We have moved into a world of of falling demographics. Demand is starting to fall across the globe. In some places the fall in population is precipitating a fall in the capacity of manufacturing plant. The world may soon not produce and distribute enough food to feed itself. We don't have a good economic model for the world that is coming to be. Remember
Remember the days of Empire, when the great nations rose because they controlled all off the food, energy and resources that they needed inside a single economy? I hope that the days of small countries that have specialized economies and reliance on a global order that allows them to thrive through trade are not vanishing. They have not vanished yet. The choices of our leaders can lead us forward into a great future of wealth for all, or cause most of the world economies to shudder and falter. Time will tell.
For America's part, it is already undergoing the largest period of industrialization in our history. America has food, energy and resource security in the face of growing world uncertainty in these areas. Foreign concerns are already shifting their manufacturing plant to America in order to insure ongoing operations. Tariffs are not needed for this.