If you watch the 24-hour news channels, talk among the drafted-in security consultants on the recent spate of letter bombs has already turned to the Unabomber.
Apart from delivery method, there appear to be some parallels: Theodore Kaczynski waged a battle against modern technology, and our current letter bomber appears to have a problem with such technology-assisted innovations as the London congestion charge and digital speed cameras.
But the common thread between this week's bombs is most likely to come down to driving. Of the two leads police are pursuing in the investigation of seven letter bombs in the last three weeks, one is a militant animal rights organisation and the other an angry motorist.
Media attention will most likely fall on the motorist with the grudge (not that all are the hyper-violent type). In an age of 750,000 signatures on a road pricing petition, such an archetype is hard to ignore.
The forums at the PistonHeads motoring site do indeed offer some understanding of a (hypothetical - we're just guessing) angry motorist bomber, but make sure to condemn the tactics. (Admittedly, one thinks it is a waste of explosives that could be used on the "scameras" themselves - speed cameras to you and me.)
But before you feel too much sympathy on the angry motorist's behalf, try out David Aaronovitch on why it is wrong to pity the picked-on motorist. Then add your thoughts below.
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