The American electoral system is rigged to guarantee that voters can choose only between Tweedle Dum and Tweedle Dee, who both are owned by the big-money elites that created and sustain them.
From this perspective, it is only logical that the heir you felt was best suited to succeed you would be too insightful to not reject the baton you tried to pass to him since it came loaded with self-esteem problems and the care-and-feeding demands of Tweedle-Dee and Tweedle-Dum.