Marching for the people killed in the incident does not mean you don't give a damn about these daily atrocities. You feel concerned by these people suffering? It's the same for millions of people, including me. But do you do something more for helping them in their despair? I bet you don't. Stop being a hypocrite. Stop following the easy way condemning without thinking a single second the evil western civilization.
Hate speech laws exists in France, condemning islamophobia in particular. I'm not saying laws solve everything, because it would be a lie. But it means the country fights against hate speech.
Many measures have always been taken to prevent youth from going to jihad (many of them are likely not to be born in muslim families). IS has always been considered as a serious issue in France. You worry me when you say "This is the lesson for not taking IS serious", because it sounds like you think IS (and by IS I especially mean their atrocities) are legitimate.
And let me also tell you something: islamophobic people basically accuse Muslims of terrorism. Islamophobic people are just fu***** morons. They are monsters. They are worthless. And right now, you're just basically accusing French people (including Muslims) of islamophobia. You're not better than islamophobic people.
Congratulations, you've just proven how much uneducated you are. You know absolutely nothing about Charlie Hebdo. You know absolutely nothing about France. I'm tired of explaining what's obvious (namely the fact that Charlie Hebdo's journalists were NOT racist and islamophobic), so I'll just invite you to read this: http://ptiteutopie.tumblr.com/post/107531134592/je-ne-suis-pas-charlie-explained
I forgot something. Jean-Marie Le Pen said: "Je ne suis pas Charlie." Who's Jean-Marie Le Pen? Well, he is the former leader of the Front National, a far-right party. Jean-Marie Le Pen is racist. He is misogynist. He is homophobic. He is a holocaust denier. He is obviously islamophobic. He was condemned several times for incitment to racial hatred. Don't you feel glad to be supported by him?
Edit : I don't know where to put this in my post, so I let that here: 17 people died. Not only Charlie Hebdo's journalists. There was also a maintenance man, a muslim policeman, a black policewoman, and four jews who were just shopping. STOP VICTIM BLAMING.