It's happening in another country on the other side of the planet, champ. Contrary to what you may believe, the U.S. isn't world police. We don't stop genocides in other countries with the wave of a hand or cast of a vote.
The genocide was happening with Kamala or Trump. Trump gives it two big thumbs up. Those who didn't vote or voted 3rd party gave Trump the permission to make an already bad situation way worse for Palestinians.