Netanyahu doesn't just invoke his late brother, he invokes the bible saying 'Remember what Amalek did to you' (Deuteronomy 25:17) [0] 25:19, one sentence later, is 'When the Lord your God gives you rest from all the enemies around you in the land he is giving you to possess as an inheritance, you shall blot out the name of Amalek from under heaven.'
[0] https://www.gov.il/en/pages/statement-by-pm-netanyahu-28-oct...
“Put to death men and women, children and infants…”
It's obviously ethnic cleansing -- this is the Israeli government's stated intent, and it couldn't possibly be any clearer.
And it's obviously immoral to wage war on an unfree and captive civilian population. This is the province of history's worst villains.