In contradiction to the usual cartoonist caricatures of right-wing extremists, Mr Marais could also laugh at himself.

ECONOMIST: Jaap Marais

And in 2012, four other right-wing extremists were arrested in Georgia for plotting attacks on the government and attempting to manufacture ricin.

CNN: Ricin: Almost never deadly

The government is blaming white right-wing extremists for the bombings.

BBC: Police raids across South Africa

Germany's problems in tracking right-wing extremists are also instructive.

CNN: France asks: Were warnings missed on Toulouse killer?

Germany is tough on political extremists, because of its Nazi past and a struggle with left-wing terrorism in the 1970s, but it is tolerant towards most groups claiming a religious basis, such as Islamic fundamentalists (not Scientologists, though).

ECONOMIST: How other countries do it