The demonstrations are about his power grabs. They have 0 to do with the genocide. On that topic most Israelis are not against him. It is, in fact, what is keeping him in power and why he wants this war so badly.
~15% of Israelis believe that a terrorist who shot up a mosque (literally all he did) is a national hero.
It shouldnt be that that hard to imagine that most of the rest are willing to look the other way in the event of a genocide against the same untermensch.
(It's an archive link because the original is paywalled).
> Nearly half (47 percent) of respondents agreed that "when conquering an enemy city, the Israel Defense Forces should act as the Israelites did in Jericho under Joshua's command – killing all its inhabitants."
> Religious interpretations play a key role in shaping these views. Nearly half (47 percent) of respondents agreed that "when conquering an enemy city, the Israel Defense Forces should act as the Israelites did in Jericho under Joshua's command – killing all its inhabitants." Sixty-five percent said they believed in the existence of a modern-day incarnation of Amalek, the Israelite biblical enemy whom God commanded to wipe out in Deuteronomy 25:19. Among those believers, 93 percent said the commandment to erase Amalek's memory remains relevant today.
The massive demonstrations in the street seem to counter your narrative though.