Does it distort the issue?
It seems that the issue, other than Dim opportunism, is whether or not the US is more likely to be hit via a weapon particularly a WMD weapon either in a container or that comes into the US via a container.
Now can a terminal owned by a Saudi Company receive a container as easily as a group of terminals, ie a port, can receive a container? I don't know the industry, but I would think so.
Did you ever see a follow up article on how we detected the radiation?
Presumably we use the same techniques with everything, and it doesn't matter whether its in the bottom of the hold, or on the top rack.
Saudi Arabia and Dubai also send planes to American airports daily. It would be far easier, to arm one or more of these planes, with any number of different kinds of weapons, including dirty bombs, than to have anything funny going on in the container terminals.