Why France?
Reason one, you got correct already: sheer Gallic coolness. Southern temperament and northern rationality - the French synthesis. Which, speaking of Darwin, surely makes the French the pinnacle of human evolution.
Reason two (let's be obscure): beauty.
Beauty - that forgotten mover of the human temperament. The French enlightenment was forged, amongst other places, in the great Jardin des Plantes of Paris (pic below). You go there for a stroll, are overwhelmed by beauty, and thus you are naturally in the mood to ponder the existence of man, of nature, of natural law, and of what is right and good and worthy in this world. And all in a peaceful, uplifted state of mind.
Note that in French gardening, as in French philosophy and political ideas, man perfects nature. Human rationality must be imposed on the world to perfect it - this imposition of order is beauty as understood in French aesthetics.
Duality, rationality, and beauty through order. France:
The result are lofty human rights. If you stroll through stern Berlin, the result is dreams about a pointy-helmeted orc army. Take a stroll in wintery Moscow, and one's thoughts produce a Gulag archipelago. Not so in Paris!
The revolution did not originate in a slum, not in a place of poverty and ugliness, but in the heavenly gardens of the Palais Royal (pic below). It is beauty that makes a man understand the nobleness of his being, that inspires him to look to the stars and dream.
It is the forgotten, at least overlooked, contribution of French culture to Western civilization: aesthetics. The pursuit of beauty. A society that strives for beauty, strives for beauty of ideals.
Also, revolutions are a summery affair. Paris excells in summer. The best part of Paris are the large public spaces. Not the cold, grey, dismal Paris of winter, but the heavenly Parisian public spaces of summer forged the revolution.
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