Could it be that, given the existing setup of the market, Uber is a good guy in the US, but a bad guy in France? This is probably not a popular opinion here, and I'm neither USian nor French, but hear me out:
In the US, there is a system of taxi medaillons whose result is that rentiers get rich [0]. The tl;dr: the right to operate a taxi is bound to license of which there is an artificially limited supply. These licenses typically do not belong to drivers but to rentiers, who rent them out to drivers. The drivers lose, the passengers lose, the rentiers win.
France has unions, which makes it unlikely that there are third party rentiers who profit off the system in the same way as it happens in the US. Perhaps the passengers still lose, but the drivers probably don't.
That makes the framework in which Uber is trying to enter very different, and it means that Uber just may not be the good guy there. After all, pretty much everybody can agree that "rentiers = bad". On the other hand, "workers = bad" has far less support.
[0] http://blog.priceonomics.com/post/47636506327/the-tyranny-of...