Isn't that a bit like saying that it's an assault on free speech if major outlets don't show examples of child pornography whenever anyone is charged for being involved in creating it? At the very least it's not actually a necessary requirement to report the story.
Wait, are you conflating the drawing of a cartoon with child pornograpy? Seriously?
The entire editorial staff of a satirical magazine was butchered in broad daylight for doing their job. Just let that sink in -
twelve people were murdered for drawing cartoons. The
only adequate response by the media throughout the Western world would have been to rigorously publish these cartoons and show them at every opportunity. For one, because what the cartoons depict is a crucial part of the news story. Secondly, to show solidarity with their massacred colleges. And third and most importantly, to send the unequivocal message to Islamists and jihadists that freedom of speech is not negotiable. Freedom of speech is the core of free societies. This is where the line has to be drawn.
The self-censorship of particularly the liberal media (though it pains me to even use the word "liberal" in this context) is not only morally insane, it is extremely dangerous. We basically gave in to the religious lunacy of the terrorists. We accepted their demand that their blasphemy laws should be followed by non-Muslims.
One of the few newspapers which published the cartoons was a local paper in Hamburg. On the same evening (a day after Charlie Hebdo), one of their offices was blown up by jihadists. By not publishing the cartoons, all the other newspapers made it considerably unsafer for those news outlets who did. Meanwhile, it doesn't matter who you are or where you are, if you publish a picture of Muhammed you are risking your life. This is the result of the cowardice of the media in the aftermath of Charlie Hebdo. Free speech is not under threat; on the topic of Islam it has already been eliminated.
Muslims have to learn to deal with the fact that in free societies they will see and hear things that may hurt their religious sensitivities. Such is the nature of free societies. If they insist that their religion can infringe on freedom of speech, then that is no longer freedom of religion. That is theocracy.