You know it isn't so much the traffic going into our ports that bother me. It is the untold hundreds if not thousands of containers that arrive that don't get searched that bother me. I am still surprised to this day we haven't had another attack since 9/11.
Agreed, and one of the reasons I hate all the crap at airports when there are so many bigger and easier targets. Laden container ships are extremely difficult to search, and an explosion at the right time as a ship enters port will leave the port useless for a long enough time to have a severe economic impact on the US. Especially Los Angeles or whatever the port is in New Jersey (the two busiest port in the US I believe).
I was at a disaster prep drill at LA Harbor I think around six or so years ago where this type of scenario was simulated with two near simultaneous explosions - one on a container ship that left the port blocked, and the other on a tanker already in port that created a large concussion perimeter and created a ginormous oil spill. If I recall right, economic damage was in the hundreds of billions.