You do not want to hang a 600 pound man. And these jamokes would find a way to pack on the pounds. If the drop is not far enough, the convict “dances” on the noose and slowly and painfully suffocates. The Libs will be crying “cruel and unusual” in a heartbeat. Though hopefully, not the convict’s heartbeat. Too long a drop and their head is pulled off. When the U.S. executed prisoners at Nuremburg (they were denied the soldierly privilege of a firing squad) they hired a charlatan with little to no experience who botched the entire process. There is (though it may no longer be current) an Army field manual on hanging. Since soldiers are executed by firing squad, they probably do not have much use for it.
A skilled hangman knew how to calculate the length of the drop and the number of coils to use in the noose based on the thickness of the rope and the weight and height of the hangee. It is a lost art.