What a bullshit argument... to all intents and purposes, the amount of fish available to both Crusoe and Friday is infinite.. until a Spanish fishing fleet turns up and strips the waters surrounding their island of anything living. Does said fleet still enjoy the moral high ground their superior technology affords them, according to Rand, or are they in fact preventing Friday and Crusoe from providing for their most basic needs by taking more than what could be said to be a reasonable amount of - surprise! - a finite resource? Surely we can acknowledge/reward human ingenuity without pursuing Randian logic to it's ultimately harrowing and absurd end game? Followers of the 'might makes right' mantra are simply looking for a simplistic absolute that refuses to acknowledge the need for societal compassion, or the existence of justice. Simple people need simple stories: people driven by greed alone need justification.
But of course, insisting that those lacking the ingenuity to take as much as they can stuff into an offshore account deserve to live with dignity makes me a communist, right Ayn?