As the post codes listed are showing 6 characters it is pin pointing buildings and individual streets. No doubt an area somewhere like Brixton has more crime than Stansted but more crime is committed in the terminal at Stansted than any individual street in say Brixton.
The locals around Luton have been complaining for years that thefts from cars parked at the airport, which has a LU2 post code has increased their car insurance premiums as they also have LU2 post codes.
Strange though why the terminal at Stansted has more crime than say Heathrow or Manchester but then there is more than one terminal at those airports so they probably have more than one postcode.
Also worth noting that Belfast Airport is number 3 for violent crime