Defensive Jewish polemics against Jesus provoked Christian book burnings.

Evidence

This view of Jesus is more apologetical (i.e., defensive) than polemical (offensive): clearly, it would be dangerous to communicate this view of Jesus to Christians. Indeed, these legends about Jesus outraged Christians who found out about it and led to the condemnation and burning of the Talmud and other postbiblical Jewish texts several times in the Middle Ages: these texts were specifically prohibited twice in seventh-century Spain. — John V. Tolan, Saracens, 154