Bear in mind that the Democrat party is made up of disparate special interest groups, all disgruntled haters of Christians, conservatives and Trump.
Pelosi and Schumer are echoing the old adage, "the enemy of my enemy is my friend". They have calculated that some American Jews agree with the anti-Israel Muslims and the majority of American Jews will vote Democrat no matter what. Hatred of Christians, conservatives and Trump is part of their calculus in appealing to their base.
Stalin murdered more people than the Nazis - tens of millions to the Nazis millions. Nevertheless, the communist monster and despot "Uncle Joe" as FDR called him, was our WW2 ally. When times are tough "the enemy of my enemy is my friend".
I'm guessing that the Democrat party is confident that regardless of what it does to Israel, democrat worshiping American Jews will not leave the party of their fathers.
I’ve no doubt you’re correct.
At the same time I believe that American Jews are fast approaching the time when many will leave the Dem party because of the blatant antisemitism of the infiltration of radical Muslims in that party.