As a (very) frequent flier, I was not in the slightest surprised to read that whoever had been planning to blow up aeroplanes decided that as shoes and underpants had proven to be unsuccessful as a bomb carrying medium, why not just post it instead? Makes me so glad I spent so long going through all those endless unpleasant hours of Security Kabuki theatre, when it turns out that the Bad Men just need to pop to the local post office.
It's rather obvious that it is harder to screen cargo than passengers, as parcels would have to be opened, inspected, and then closed again. X-rays aren't actually much use, if you don't know what you are looking at, and whether the high value electronic gadget that is being shipped should have that particular combination of wires, components, etc. Try that with any sensible amount of airfreight, and you'll bring the whole system to a complete stop. (Rather the terrorists aim in the first place.)
What to do?
One approach is to accept that some planes are going to get caboomed, and keep on as usual. Not likely to be acceptable, and I sure wouldn't like it, as I am often on one.
Another is to separate all freight and passenger traffic, but the disruption would be enormous, and it is unlikely to prevent cargo planes being blown up. So, fewer passengers die, but having a jumbo jet spiralling in bits into the middle of a major urban centre isn't likely to be much more acceptable.
The profiling of the sender didn't help much as it turns out the putative sender was a presumably blameless computer engineering student who was a victim of identity theft. (Which they seem to have concluded rather quickly, thank goodness for the poor woman concerned, as people have ended up in extra-judicial custody for much less.)
Other than that, there really much that can be done other than intelligence gathering, and if that worked we wouldn't be reading these headlines.
Looks like air travel just got that much more interesting. Wonder what ineffectual crap we'll be stuck with next?