It shouldnt....yet we see hurting peoples feelings gets you beat up and killed everywhere in the world. Free speech has consequences, if you are mocking people and being jerk to them, you are bound to get an ugly reaction. go out in the streets and mock people walking the streets and see how long before someone punches you.
Every speech isnt worth the same, and these guys knew fully well by mocking people the way they did was upsetting people. But they convinced themselves they were some sort of heroes who was proving some sort of freedom the rest of us couldnt live without. This is why the Charlie guy said he would rather die than have no freedom. The fact that someone living in secular France is even thinking their freedom is under so much threat that if they cant mock muslims, its not worth living says it all. Calling these killers savages, animals or whatever isnt gonna change those people got killed. And they died for something so meaningless imo