In the context of the horrific antisemitism of the last century, I believe that this ecumenical service was quite appropriate. It marked the 75th anniversary of Kristallnacht. Pope Francis, then Cardinal Bergoglio, was inspired to hold this service every year. The SSPX antisemites were driven by Satan to disrupt it.
God gave us His Son to listen to Him (Matthew 17:5). It is our duty to evangelize the Jews even more, in the context of the horrors of 20c. The "ecumenical service" is an oxymoron; a prayer to Christ to prevent another Kristallnacht would indeed be quite appropriate.
SSPX antisemites
What makes you think they were anti-Semites? I believe I explained fully why the common prayer in a Catholic Church was inappropriate logically, evangelistically and legally for the canons of the Church herself. Am I now an "antisemite"?