FDR maintained at least some degree of ideological purity.
The Current Occupant of the White Hut has mixed together some serious rivals in the race to achieve world domination, between the neo-Socialists and the Worldwide Islamic Caliphate.
In the end, there can only be one.
Of course, once the Marxists have been fully subjugated, the Worldwide Islamic Caliphate may have to deal with its own internal schisms and factions.
Uneasy lies the head that wears the crown. Successful regicide is either the most terrifying prison, or the greatest disappointment, the successor can bear.
Unsuccessful regicide, on the other hand, pretty much guarantees the fate of the perpetrator.