Given the history of the term and it's background in common vernacular, it's very easy to see why Jewish people, such as myself, are up in arms over the Palin's use.
ADL National Director Abraham Foxman released a statement today:
It is unfortunate that the tragedy in Tucson continues to stimulate a political blame game. Rather than step back and reflect on the lessons to be learned from this tragedy, both parties have reverted to political partisanship and finger-pointing at a time when the American people are looking for leadership, not more vitriol. In response to this tragedy we need to rise above partisanship, incivility, heated rhetoric, and the business-as-usual approaches that are corroding our political system and tainting the atmosphere in Washington and across the country.For more on the history of the term, click here.
It was inappropriate at the outset to blame Sarah Palin and others for causing this tragedy or for being an accessory to murder. Palin has every right to defend herself against these kinds of attacks, and we agree with her that the best tradition in America is one of finding common ground despite our differences.
Still, we wish that Palin had not invoked the phrase "blood-libel" in reference to the actions of journalists and pundits in placing blame for the shooting in Tucson on others. While the term "blood-libel" has become part of the English parlance to refer to someone being falsely accused, we wish that Palin had used another phrase, instead of one so fraught with pain in Jewish history.
The “blood libel” refers to a centuries-old false allegation that Jews murder Christians – especially Christian children – to use their blood for ritual purposes, such as an ingredient in the baking of Passover matzah (unleavened bread). It is also sometimes called the “ritual murder charge.” The blood libel dates back to the Middle Ages and has persisted despite Jewish denials and official repudiations by the Catholic Church and many secular authorities. Blood libels have frequently led to mob violence and pogroms, and have occasionally led to the decimation of entire Jewish communities.
The blood libel is particularly appalling in light of the fact that Jews follow the Hebrew Bible’s law to not consume any blood, which is found in the book of Leviticus. In order for an animal to be considered kosher, all its blood must have been drained and discarded.