Of course you are correct that lack of food and water makes people easier to overpower physically. But the Alexander Hamilton quote is: "In the general course of human nature, A power over a man's subsistence amounts to a power over his will." That's simply untrue.
it is NOT untrue ... it is situational.
the will bends to needs for survival... and often it breaks... for the majority.
there is a minority whos will will not bend or break.
this has been written about many times by leaders, philosophers/thinkers, think tanks, foundations, and intelligence services/operatives.