I see this as proof that we don't really live in a democracy. Most people are anti-genocide but a politician asking for a ceasefire is a fringe position. Most people want a higher minimum wage, but it's considered a fringe position in Washington. Most people want universal healthcare, but it's considered a fringe position.
Biden clearly doesn't give a shit about winning the next election.
Muslims and Arabs are maybe 1-2% of the voting population, and the already live in primarily blue districts. Everyone else will forget or doesn't give enough of a shit to make it a top voting priority.
The alternative is Trump, in which case the US might nuke Gaza just for fun, and then turn the west bank into a Trump owned water park.