Because that&#x27;s a weapon to only use in a hot war?<p>Because it&#x27;s a fungible commodity in plentiful world supply, and we&#x27;re better off benefiting from that trade ourselves?<p>Because it most directly puts the lie to their claims their economic system is superior?  &quot;If it&#x27;s so good, why can&#x27;t you grow enough food for yourselves but have to buy it from us?&quot;