That list is laughable at best. There are an untold amount of Brits, Germans and French living in Cape Town, SA. Maggie Thatcher's own son lives out there happily, Prince Harry's girlfriend (ex?) studied there for four years, the CEO's of B.A.T, Richemont, Remgro refuse to move anywhere else. Plastice celebs like Britney Spears, Bono and Alicia Keys is constantly seen in Cape Town, Jean Claude van Damme has 2 houses in Cape Town, Michael Schumacher practically lives out there 6 months a year. Most European athletes head to Stellenbosch (30min from Cape Town) to train and get away from the European winters. A Norwegian ex girlfriend of mine married a British fella living out in Cape Town and she said she will not come back to Europe for all the money in the world.
That is only the city I know a lot about. On that list, I've only been to Moscow (well, and Cape Town a lot), and I have not felt threatened or in danger even once. That included walking around night times and some very seedy areas at times.
Granted, perhaps that list is on context with the citizen/muder ratio, but telling me that a place like Johannesburg, Rio or Baghdad with it's constantly suicide bombs, is not worse than a place like Cape Town or Detroit, is laughable at best.