[Carth]

As with everything, there has to be a balance, the costs involved versus the chance of something happening. A risk assessment as it were.

You could now put an armed soldier in every train carriage, on every bus, every motorway service station, or wherever you think there is *potential* for an incident. You can soon go over the top and achieve nothing but higher prices/costs to the general public.

Consider local councils spending £1.5 million on snow clearance initiatives . . but then it doesn't snow that year. Obviously that's an acceptable risk, whereas guards on every street corner isn't.