What Netanyahu is doing in Gaza to Palestinians is broadly popular in Israel. The "opposition" coalition leader has made genocidal statements about Palestinians and there's no reason to think his leadership would be any better. This is a society where people directly benefit from ethnic cleansing and have spent decades already justifying it to themselves to get to this point. It's not going to be an easy fix of replacing one guy and focusing on him misses all the institutions that were constructed to facilitate genocide.