The "Je Suis Charlie" thing was used more for fear mongering about how western civilization was under attack from 'barbaric islamist forces' or whatever than any sincere concern for the victims. The only reason that this got so much media focus and a hashtag and worldwide attention was that the perpetrators were brown Muslims and the victims literally died on the hill of being able to make racist cartoon strips no matter what people said. I quite distinctly remember my dad using the attack at the time to claim that Muslim countries needed western countries to help govern them because they were so backwards.

To be clear, I absolutely condemn the attack and none of the victims deserved to die in the slightest; but the way the media laser focused in on it and the way they spun the story afterwards was absolutely a racism thing.