“Finish the job” to me means giving them much more support than now, and having them annihilate any kind of Palestinian resistance. Basically Israel wins, there is no Palestine anymore, and Islamic people in Gaza get treated like Uyghurs in China.
That would’ve caused the same amount of casualties, if not more, and ensured every surviving Palestinian would be forced to live as a subhuman. And even if I’m wrong, it doesn’t really change much if you draw the line at “aiding a genocide”. A 3-month genocide is still a genocide.