2) There is evidence suggesting Israel has an intent to expel. From govt officials saying they are rolling out the Gaza Nakba to Bibi lobbying foreign govts to press Egypt to take in Palestinians, it's clear that permanent expulsion is on the table - if not even the preferred option for some

3) The scale and tactics of the violence also matter. Damaging or destroying more than 45% of all housing, laying siege to a territory and denying civilians access to food, water and fuel coerces people to seek safety elsewhere.