I know it's really easy to just lambast the publishers as cowards for refusing to publish the cartoons (as you post anonymously or semi-anonymously on slashdot, you brave soul), but it's not an easy choice to make. It's been clearly demonstrated that by publishing mohammed cartoons, there's a non-zero chance that some nut-job will break into your building and murder a bunch of your staff. Are you as an editor willing to take that chance? Are you willing to put your staff at risk, even for a minimal chance of violence against your station? It's sooooo easy to criticize them for not publishing offensive cartoon, but I really doubt that the majority of you would post a crude drawing of mohammed on your facebook accounts, or drop off a few thousand copies of an offensive cartoon in your neighborhood mailboxes (with your personal address listed). Because then you're truly willing to take the same upon the same risk that these cartoonists (and their publishers) take.
From a litigation standpoint alone, is it worth publishing an offensive cartoon? Probably not if you're in a litigious friendly nation. If you're the editor, and if some shit goes down, and there's the slightest possibility your organization could be held liable for the deaths of your staff because you totally *knew* this could happen, and could have avoided it by not publishing the offensive article - you bet your ass they'll get sued by the families of the victims. That risk probably isn't worth whatever benefit they get for being more ballsy in the eyes of the viewer. The editors know this and factor this in their decision making.
Whether to publish or not is more of a
Prisoner's dilemma than it is Streisand effect as mentioned elsewhere in the comments here, except with more than 2 "prisoners" (publishers - assume not publishing is equivalent to testifying in the analogy). The better move for yourself is to not publish and have no risk. But the better move for the collective is to publish. If all the publishers decided to publish, that would be the greatest overall benefit for freedom of speech, because it demonstrates they're not afraid of terrorism. It also minimizes the risk for each publisher, because terrorists don't have the resources to target all of the publishers in existence. They might even give up completely, realizing there's too many people offending their religion. But if nobody publishes cartoons out of fear, it reinforces the idea that threats of violence work (and the censored SouthPark scene in the "I learned something today" segment is true). If only handful of publishers decide to publish offensive mohammed cartoons, then it still reinforces the idea that threats of violence work (because most publishers aren't doing it, clearly because they're afraid of terrorism), AND it puts these few publishers at a much greater risk of terrorism. It fucking sucks, but the only way this is going to work is if a large majority of publishers decide to print these cartoons as a response.