Even if Prof. Ariel Toaff were a good historian,he has extremely poor jugedment not only about selecting a subject that can cause tremendous harm but in presenting presumptions as fact. I would compare the results of his work to the behavior of a doctor who would tell an emotional heart patient that his days are counted even though he knows a few can survive a long time with attentive care. In both cases even if there is a shread of evidence (which in the former case there is none)truth is potentially a deadly tool.As the French say : "le silence est d'or" in such occasions.
One student killed, three wounded at Arizona campus during fight (a)
from the article: MKs demand the author of blood libel book be prosecuted