Proportionality in war is a synonym for lethal stalemate, if not defeat.
When two sides go at it with roughly equal forces, weapons and strategies, the result is often a horrific deadlock — like the four years of toxic trench warfare on the Western Front of World War I that resulted in 12 million fatalities.
The purpose of war is to defeat the enemy as quickly as possible with the least number of causalities — and thereby achieve political ends.
So, every side aims to find superior strategies, tactics, weapons and manpower to ensure as great a disproportionate advantage as possible.
Hamas is no exception.