You act like there was a non-genocide option. Once Hamas did that attack, there was no stopping the crazy right wing Israeli government from doing what they are doing.
So what? The US should take a hard line against Israel anyways, even if it does no good, right? Great, so Israel is removed from the US sphere of influence and goes shopping for a new sugar daddy. That would be China, or more likely Russia. Now Russia is chummy with both Israel and Iran, which has the inconvenient little side effect that the Palestinians will lose the support of Iran. But who cares about the Palestinians anyways.
Any hope the US had of restraining Israel in any way whatsoever is contingent on our continued support. Without that, we have no influence and someone else steps in.
I’m not claiming that Biden has handled this perfectly, but the general direction he has gone has been in the best interest of saving as many Palestinian lives as possible. There are no clean hands in foreign policy.