Biden did NOT approve weapons for use in the genocide. You can see the repeated statements of fact on that.
Biden approved weapons for the legitimate defense of Israel, which Israel then misappropriated and misdirected for use in Gaza. The blame for the Gazan genocide lies solely on Israel.
"The president has made clear Israel has a right to defend its citizens, consistent with international law and international humanitarian law, and to deter aggression from Iran and its proxy organisations.
"We will continue to provide the capabilities necessary for Israel's defence."
At no point did any US agency approve, authorize, or coordinate the genocide. At all. That's a lie perpetuated by anti-US interests intent on blaming the US for everything bad that happens in the world.