kakistocrat
A very ill-qualified ruler; a member of a kakistocracy.
On the other hand, should the kakistocrats in Iran stick with the name of expediency to describe their power brokers?
Where it comes from
From Ancient Greek κάκιστος (kákistos, “worst”), superlative of κακός (kakós, “bad”) + -κρατία (-kratía, “power, rule, government”) (corresponding to -crat).
Adapted from the Wiktionary entry kakistocrat (CC BY-SA 4.0).