But, especially within hours of a tragedy unfolding, journalists and pundits should not manufacture a blood libel that serves only to incite the very hatred and violence they purport to condemn. That is reprehensible.
I think we can all agree that manufacturing false claims that Jews have murdered a Christian child to use the child's blood for ritual purposes is reprehensible, particularly within hours of a tragedy unfolding.
John Scalzi is more eloquent than I am on the subject.
Also, see Got medieval for a somewhat depressing review of the need to remember that the Blood Libel was not only a very specific libel against Jews, but that it should not be confused with other very specific libels against Jews.
And Colbert weighs in.