What makes you think Biden is responsible for Israel's actions? If my brother or my neighbour does something to harm someone and the results of this harm come to my awareness, explain without emotion, using logic, how and why should I be held responsible for the results of his actions, and where do we draw the line?
If I don't know why something has happened and I go out and ask why, and people blame me simply for simply asking the very question, who is responsible?
Clearly, the person who looks to blame the person asking the question must have a dogma, they must have a reason, it's very reasonable to believe they must have a stake in the question not being asked which obviously means that they could know who is responsible.
Nobody voted for a genocide. I certainly doubt that anyone in the USA let alone Biden would endorse genocide.