We're safe - relatively speaking
Not that I don't agree with spending the money on protecting our shores, but:
In 2006, alcohol killed 8,758 people and cost the country an estimated £20bn. Tobacco killed 114,000 people. Road deaths numbered 3,150.
By way of comparison, since 2001 the annual death rate from international terrorism in the UK averages out as eight.
We do seem to have copied the US level of fear and if we let it rule us I think it will be bad for all.