What was done on Oct 7 was bad but no where near as inhuman as what has been done in response, given that half of what happened on Oct 7 is Israeli lies and propaganda
The Israeli leadership is perpetrating genocide on the Palestinians, if pointing that out is anti semitic then there is something wrong with what semitism stands for
Israel has nuclear research reactors, look it up
https://en.wikipedia.org/wiki/Israel_and_weapons_of_mass_destruction#:~:text=Israel%20is%20believed%20to%20possess,%2DProliferation%20Treaty%20(NPT).
there's also a distinct possibility Iran already has nuclear weapons, and it is a given that Israel is going to act very stupidly and massively escalate the situation as they always do, possibly bringing in Russia, so Biden is right to say its best to end it right now.