This article (in German) describes the different strategies in Berlin and Hamburg in regard to fire raising of upper class cars.
The media reports with sensationalism about burning cars in Berlin, does strange campaigns about it, there are rumours about a political background being applied to every incident...the result is that many cars burn.
Hamburg on the other hand does largely ignore the problem in publications, no rumours are being pushed by local media - and the # of burning cars is shrinking.
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I wonder whether the link to defence was obvious enough?!