Oscar Pistorius was charged with murder after killing his girlfriend in their home . Ron Irwin : Walled complexes like Barnes ' home are popular across South Africa . He believes living behind high walls changes people 's attitudes about security . Irwin : Residents tend to be more careless and casual when they live in a block of concrete .
Oscar Pistorius was charged with murder after shooting his girlfriend in their home . Ron Irwin : Walled complexes like Pistorius ' home are popular across South Africa . He says living behind high walls changes people 's mindset about security . Irwin : Residents tend to be more careless and casual when they live in a maze of concrete .