As an average, meritocratic grand schools provide about 70% of the political parties leaders and members of cabinet.
One of the most striking cases of reality denial in contemporary France is demography: issues like birthrate, life expectancy, immigration, and emigration. On the face of it, you can hardly ignore such things, since they constantly reshape your environment and your way of life. Even without resorting to statistics, you are bound to perceive, out of day-to-day experience, what is the current balance between younger and older people, how many kids are to be found at an average home, the ethnicity or religion of your neighbors or the people you relate to at work or in business.
The French elites, however, either Right or Left, managed for five decades at least to dismiss the drastic demographic changes that had been taking place in their country, including the rise of Islam, since they clashed with too many political concepts — or fantasies — they had been brainwashed into.
My bet remains: We will see France cede territory in our lifetime.