L'Osservatore Romano, the Vatican's official newspaper, tries to contrast good and bad anti-Semitism by arguing that "good" anti-Semitism is natural and thoughtful.
According to the Vatican:
"Anti-Semitism ought to be the natural, sober, thoughtful, Christian reaction against Jewish predominance."Any other kind of anti-Semitism is
"nothing but an artificial form of Judaism itself, which has introduced and maintained it so that it will be impossible for the true anti-Semitism to be organized, to be put into action, and to succeed."
So, true and good anti-Semitism "is and can be in substance noting other than Christianity, completed and perfected in Catholicism," while false anti-Semitism is a creation of the perfidious Jews to discredit true anti-Semitism and raise sympathy for Jews among the population.
It should be assumed that articles such as this, printed in the Vatican's official newspaper, accurately reflect the sentiment of Pope Leo XIII at this time as well as official Vatican policy towards Jews.