This is a hard one for me, having a french wife for 20 years I am concerned - I will say killing someone for their writings is never the thing to do, period, free speech is free speech. BUT having said that, when someone is secular as most french are and CHARLIE certainly was they go after culture and politicians but the most “humor” they reserve for religion.
When you provoke and poke people in the eye for 20 years for their deepest religious beliefs - if someone did that crucifix in urine or that type of provocation every week and put it on national display - do they not have to accept any responsibility for their action? Again, death is most certainly NOT the thing to do, and I am frankly somewhat shocked I feel this way - I have told my kids for 15 years they are responsible for their actions, how can I tell them Charlie is not. They are holding a moment of silence at the french school my wife teaches at and the kids attend today, I stand with them.
I have an idea.....IGNORE IT! That's that best punishment you can give to these attention seekers.