As president he has the ability to restrict arms deals, veto this bill and voice dissent, has said that Palestinian protestors are antisemitic and lawless, has changed his redline so Israel could do more genocide while saving face, has doctored evidence to prove no genocide is occurring, has a cabinet (assigned not elected) voicing unwavering support to Israel, has circumvented congress for arms deals, has voiced support towards police violently breaking up peaceful encampments, has personally relayed fabricated propaganda (40 decapitated babies) to the american public and recanting it privately. You're asking why the 'leader of the free world' is being criticized by communist? Because he's actively complicit in a genocide and is directly pressured by an upcoming election to change course or inevitably lose. Everyone should be disgusted by biden and working overtime to ensure focus groups begin to show that Israeli support will demolish his chances of getting into office. Otherwise this will continue and quite honestly I don't believe any of you really cared for this to change.
Edit: or just watch the video ad free on piped, don't count your view as engagement and form your own opinions. Or instead put the entire works of Norman Finkelstein into chatgpt and make decisions on a summarizer, shoot let's just all rely on chatgpt to stay informed. What could go wrong!