If Israel is engaged in genocide, there is no defense for American defending it. From Patrick Lawrence at consortiumnews.com:
At this point, Washington’s defense of Israel becomes as baldly obscene as the apartheid state’s long record of lawless aggression toward the Palestinian population.

Man with body bags in Jabalia, Gaza Strip, Oct. 9. (Bashar Taleb, Palestinian News & Information Agency, or Wafa, in contract with APAimages, Wikimedia Commons
There have been many, very many singular moments among America’s purported leaders and assorted officials and commentators since Hamas staged its daring assault on southern Israel on the morning of Oct. 7. Let us consider a few of these moments and draw some conclusions.
Let us look closely at what is being said and what the American public is now urged to think and accept as Israeli forces prosecute a campaign against Gaza’s 2.1 million people so extreme as to suggest ethnic cleansing is, as many have long argued, the ultimate Israeli project.
“Well, there have been some members of Congress who have called for a ceasefire, and they have not gone as far as backing the administration’s call for support for Israel.” This was a reporter’s observation at a press conference last week that featured President Joe Biden’s press secretary, Karine Jean–Pierre, and Jake Sullivan, the president’s national security adviser.
Jean–Pierre’s response merits careful parsing for the large implications we find in it. In my read it reflects Washington’s increasing desperation as Israel’s conduct toward Palestinians tips into a savagery no rational human being can defend.