He must've done 'extensive research' during the last 10 days. Or maybe, though highly unlikely, his and his family's life were threatened, he was told he would be fired and most importantly he was made to understand that his work put 'future of jews' at risk. Another job well done.
Obama says world must reach climate deal in Paris 'while we still can' (Reuters)
from the article: MKs demand the author of blood libel book be prosecuted