Biden isn't pro genocide, at least there is no evidence to say that. The Biden administration has been against the ground invasion from the start.
Biden has made some missteps in my opinion, but America pulling support for Israel was never a real option. Israel does require aid, but Netanyaho doesn't care if that aid comes from the US, or from his buddy Putin. Israel realigning with Russia would put Palestine in an even worse position because it would threaten their support from Iran.
Then, of course, there is the risk of a regional war breaking out of Iran takes the strained relationship between the US and Israel as an opportunity. That could easily pull other countries in and become WW3.
Foreign policy is about more than just virtue signaling. It's outcomes that matter, and what a lot of people are calling for will not get them the outcomes they are looking for.
Not that I'm shaming anyone for pressuring Biden. The positive movement on aid shipments was very likely helped along by the protest votes in Michigan.