Everyone cares about genocide, just not everyone is dumb enough to think that a president of another country has the ability to stop it from happening.
Do you have any idea about the nature of the existence of Israel? Iran hates them, Irak hates them, Syria hates them, Lebanon hates them, Egypt and the Saudis hold up their noses because they're pragmatic enough to look the other way as long as that gets them the favor of the US. It's a tiny country with a small population which viability as a state is dependent on several European and North American countries being willing to give them full military support. If the US threatens them with a blockade, it would be possible to negotiate Palestinian statehood (not just stopping the genocide) within weeks, and a two state solution would no longer be a pipe dream. Instead, the US has been protecting them from any potential reprisal against their crimes.
There are great arguments about why you should vote for Biden, but flaunting this much ignorance is certainly not doing his camp any favors.