In short: it's just embedded in the French culture. France has le Tour, we have football.
Switzerland takes this to a whole 'nother level, saying nothing about the Netherlands, Denmark, etc.
In the States, I feel very much like an enemy on the road. I mean, I'm just riding my bike to work.
Also look at: public transportation.
It's no wonder that higher economic mobility people have chosen essentially a private town car company (or at least a virtual one, that undermines things like workers rights) to replace personal car ownership (at least partly so) and not a bicycle or public transportation. The illusion of the status quo is still there - except that it's enhanced, as you're paying a premium for someone else to do the stressful work for you.
As an American that has explored Europe, it's just not the same thing. Trains are amazing, people flaunting wealth by buying enormous cars is seen as a faux pas. City centers are turning into car-free zones. Being simply a pedestriann isn't see as a backwards thing. Cycling is taken much more seriously and things like safety regulations and road-side checks are a Thing.
I know biking in a city is very different from biking on a road in the middle of nowhere. And, even I, prefer to avoid crowded circulations and difficult crossings, because those other road users are pesky assholes (at least in Paris) when it comes to sharing anything with pedestrians, cyclists, or even other motorized vehicles. Kudos to cyclists support groups!