Whilst I agree wholeheartedly with that contextual analysis, I can't help reflecting that rentiers have always been attracted to the notion of unearned income, irrespective of political discourse. My forebears all lived in property owned by someone else, mostly farmers' tied cottages and more latterly in rented urban terraces. My bet is that few, if any, of these landlords believed there was anything wrong with how they benefited from their ownership of land/property.
The Macraes may well be mere participants in the system, but they are most certainly enthusiastic and determined participants clearly driven by avarice.