Older Than Feudalism: Creon from Antigone has been interpreted as an extremist, although to the audience of the day his actions were seen as less extreme, and Antigone's as more controversial, than to most audiences today. He insists on law and order at the expense of basic compassion, enforcing his often baffling edicts with the death penalty. But while he's one of the archetypal dictators of literature, he sincerely wishes peace and prosperity for his country. He's also seen as something of a family man, bending over backwards to offer his prospective daughter-in-law forgiveness of her rebellion, should she accept it.
Brutus from The Fall Of Julius Caesar legitimately believed that killing off Caesar would be for the best of the Roman Republic. In fact, he was actually reluctant to do it unless there were people besides senators who wanted it done. Unfortunately, he had to do this as well as go to war with what was once his home with the rest of the conspirators.
Giovanni da Procida from Verdi's opera I Vespri Siciliani (The Sicilian Vespers). He'll sacrifice anything for the freedom of Sicily (he says so himself), and his actions eventually lead to a Kill 'em All ending.
The Wizard of Wicked. He was, in his words, practically thrust into being leader of Oz during an age of strife, and people wanted someone or something to blame. He cynically gave them one. He genuinely believes Oz will fall apart without a common enemy to unite against: he simply used the animals as a scapegoat, but wants to care for his city - and, especially, the students who come to see him.