His VP can come out and voice her disagreement with his actions, distancing herself from him and those actions.
It's the simplest solution by far.
Not doing so and instead having the party loyalists go around raging at any who criticize Biden's complicity in Genocide, is not the simplest solution.
And yet here we are, with the tribalists piling up on any criticism online instead of Kamala Harris simply voicing her disagreement with Biden's policies.
One wonders why exactly the chosen option is not the simplest and most likely to lead to a Trump defeat.
Zionists are Nazis.
Same propaganda techniques, same violent unrestrained racism, same calous murdering of those of the "wrong" race.
The only difference is that the "superior race" the Zionists claim to represent is a different one, as is the one they deem untermenschen (or specifically in their words "human animals").
You can literally replace "Israel" for "Germany" and "Jewish People" for "Arian Race" in some of the speeches coming from the Israeli government to end up with something pretty close to some of the Nazi speeches.
If you want to be technical about it, Zionists are ethno-Fascists - which is a rarer and far more racist and violent kind of Fascism than the traditional one - like the Nazis but they're not specifically the Nationalsozialistische Deutsche Arbeiterpartei (so, not actually the NAZI party), just a modern version of it with a different set of races they see as ubermenschen and untermenschen (what the Zionists call "the chosen people" and the "human animals").
So yeah, a guy like Biden actively supporting these modern Nazis with weapons whilst they commit Genocide is also a Nazi (just like somebody giving the KKK weapons knowing they will be used to kill afro-americans counts as being KKK) and those people doggedly coming out to defend Biden of any and all criticism of his actions in this are tainting themselves with the stink of this modern Nazism (they can hardly claim they're against the mass murder of children whilst actively protecting one of the key guys in making it possible)