Diary of a rail fan in Kansai,Japan(Ver.2)

About world's rail news, general news, my train pictures, and travel diary)

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Why can the rich on the border live there?

edition.cnn.com

When I saw the picture that middle-class area and poor-class area is clearly divided, I wondered why middle-class houses along the border are safe.
They may easily be targeted by the poor living across the road. Otherwise, policemen are deployed to keep an eye on the border?
It remains mystery.