I agree that Sarah Palin was treated unfairly by the mainstream media and that violent rhetoric was flying on both sides, but that is entirely different than the nation's most popular "news" station encouraging their employees to promote exaggerations or flat-out falsehoods to the public. Fox News is a large part of the public discourse, whether we like it or not, and its constant distortions of the truth, whether regarding death panels, the "hoax" that is climate change, or the Muslim Caliphate trying to take over the Middle East, are worse for public discourse than one cable news week worth of criticism towards a figure that seems to seek attention from and to thrive off of controversy. The media blaming Sarah Palin for the Tuscon violence is now mostly over, but Fox is still poisoning the public debate on important policy issues every day. I would consider that a gaping difference between these two instances of biased media that illustrates how much more dangerous Fox News is.
Further, no one accused Palin of murder, they just argued that she created an atmosphere that could have promoted the violence in Tuscon. Those are two very different things.
On another note, even if you don't believe in the accuracy of an anonymous Fox News insider, this link discusses some recently leaked Fox memos that help make a similar argument.