What about free trade? Containers full of what? No panic here we just need to be smart. For some reason mainstream media promotes ignorance.
Not saying the premise is unsound, just the excessively ridiculous scenario the author put forth. Some such attacks could be successful, but the scale of the work involved would require a large labor force, or factories set up to produce those weapons. Either way, it would not take long to figure out who is responsible and establish counter-measures.
Ignorance is promoted from all sectors of our society. Those who seek power would rather have a compliant work/fighting-force, incapable of critical thought. They are much easier to control.