Hitler was right wing. Two decidedly right-wing nationalist dictators, Hitler and Tojo, far surpass Mao and Stalin. Hitler and Tojo's World War II caused 60 million deaths between them.
Whatever. It's often semantics to try and parse this question. But I do know this: just because you sit on the same side of the political spectrum as someone evil, it doesn't mean your views are wrong. You shouldn't abandon social democratic ideals simply because Pol Pot was a socialist any more than you should abandon love of country because Hitler and Tojo took nationalism to deadly extremes. It's absolutely unreasonable to judge your own views based on those few in history who twisted them beyond moral comprehension. Did it really matter that the bullet that killed you came from a Communist or a Fascist gun?
And anyway, when you get to death tolls in the millions, does it matter which side of the spectrum the dictator sits on? Past a million they're all pretty much equally horrible.
North Korea’s government & economic systems pre-date ideas of left & right. It’s a very old-fashioned state, a hereditary monarchy in which the ruler is worshiped, is considered to have supernatural powers, & owns everything & everybody.
P.S. Note that the origin of left & right wing comes from revolutionary France, where the supporters of monarchy, religion, aristocratic privilege & tradition sat on the right in the National Assembly, & the supporters of revolution sat on the left. The left supported a more open economy & more personal liberty.
Why you would include Hillary, and Obama in that list is a mystery. Hillary was never the leader of any country.