>>213015711Because it takes a ton of planning and consolidation of your own power to do something like that. If Don Vito had done it in his weakened condition, with his oldest son dead and Michael hiding out in Italy, there probably would have been retaliations. It only worked for Michael because he had taken power, knew who the traitors in his own family were (Tessio and Carlo), and had tard-wrangled Fredo. He was in a position to do it right without it resulting in infighting and retaliations.