He’s a man without a country. His advisors failed him.Yes, a lot of those 71% are people who think he is guilty of facilitating Israel's atrocities. However, a likely bigger chunk of that 71% are right wing nuts who think Biden isn't supporting Israel enough. Don't forget: this is America.
Basically, Biden is fukked politically when it comes to the war. He loses no matter what.
Of course, it would be ideal if he didn't care about politics and simply did the right thing.