Hate speech is illegal in France. I am glad it's not that way here in the US, but it seems silly to complain. And Dieudonne is a repeat offender when it comes to advocating violence against the Jewish minority. He's getting what he deserves.
And comparing this to the cartoons is silly. It's not hate speech to violate the tenets of a religion and mock their prophet. It is hate speech to advocate violence against the people in that group. That goes for Muslims and Jews.
^ This. I don't understand why people think that advocating violence should be legal. Mocking a guy who is considered a prophet by some is obviously very different from expressing support for killing people because of their religion. Jews in France (and in pretty much all of Western Europe) are already threatened because of anti-Semitism by Muslims, we'd better not legalize that.
Credit where credit due, I think that Manuel Valls' government has made a lot of effort to secure Jewish community and to counter terrorism.