Just to ease people's concerns over the risk of terrorism, these are the deaths from terrorism over the last few decades...
And then showing deaths from terrorism in Europe as a percentage of total global deaths from terrorism...
When we look at terrorism, it's changed. We've gone from high concept and high tech attacks like 9/11, and we've stopped them being feasible.
They then moved on to lower concept high tech attacks such as the 7/7 bombings. These have since been made far more difficult, and have been very rare subsequently .
So we are left with low concept, low tech attacks such as Barcelona, London and Finland.
In Barcelona, the checks put in place to prevent major terrors attacks worked. They wanted to build large scale bombs and put them on trucks, paperwork checking stopped this being possible.
So, whilst it is no consolation to the families of those who died, things are perhaps not quite as bad as they seem.