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Part of the story is that the cool and trendy crowd have decamped to Biarritz these days.
Which means that what remains is just old people; pieds noirs (although very much overrated as a factor); migration; the development of a particular economic model with huge levels of inequality, lots of especially precarious jobs (especially logistics or tourism oriented), car dependence, appaling sprawl etc, etc.. which all leads to a particularly acute sense of cultural and social anxiety.
Is there a reason Biarritz has become much more popular compared to the Cote d'Azur for the rich and famous? For Anglophones, Nice, Cannes etc. are still the still bywords for luxurious resort towns.
Thanks for your analysis of the underlying socioeconomic factors driving political patterns in the Cote d'Azur. It is comparable in some ways to the political dynamics of the American Sunbelt but with a much smaller nonwhite population.