I think it's quite juvenile in it's thinking. The writer has UTTERLY missed the point.
Yes, Charlie Hebdo is offensive. To many people. The outrage is at the overreaction. If a group of Muslims had responded in art, or in writing, tearing apart Charlie Hebdo and its views, then most of us would have wholeheartedly supported them. And yes, perhaps there'd have been some handwringing, and calls for a ban.
But what happened is that a bunch of nutters went on a murder spree instead. And that's woken us all up to the importance of free speech.