Btw, the proportionality requirement in the law of armed conflict relates civilian casualties not with military casualties but rather the military advantage gained. The military advantages of killing a single low-level Hamas combatant are rather limited, and thus the room for civilian casualties should be rather limited as well.
> The principle of proportionality prohibits attacks against military objectives which are “expected to cause incidental loss of civilian life, injury to civilians, damage to civilian objects, or a combination thereof, which would be excessive in relation to the concrete and direct military advantage anticipated”.
The way it's worded is to prevent destroying civilian targets for no military gain.
There’s a whole lot of wiggle room in that phrase.
There is no justification in the current situation in Gaza to justify anything close to the numbers quoted.