Netanyahu's atrocities are, yes. Biden could and should say that he respects the decision of the ICC. He should halt all arms to Israel as long as netanyahu is in power. All that is true.
Unfortunately, what is also true is that if it was Trump instead of Biden, Trump would do a photo opp in a tank with Netanyahu, blasting away at refugee camps and calling the victims horrible names as he does so. He'd probably tweet out, "TAKING CARE OF BUSINESS WITH BIBI!!"
Few people hate that segment of the world population more than Trump.
When the rage of our idealism clashes with the reality on the ground, we usually end up losing the bigger fight.