Alexander the Great was not an evil ruler? Have you heard of what he did to Greek rebellions?
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There are such incidents in the career of Alexander that tarnish his reputation, but making an example of a city in armed insurrection at his rear, is quite a bit different than a systematic regime of terror in the 20th century. For his time and place, Alexander would have made a pretty enlightened ruler.
Yes by present standards of morality, none of these leaders can justify all their actions. But even Gandhi, for his personal opinions ? Consider their goals and personal achievements. I mention this because the same issue of morality came up in the discussion of History's 10 greatest military leaders.
http://forums.civfanatics.com/showthread.php?t=304983&goto=newpost
I do agree it is an inseparable part of rating these historical figures, that unnecessary cruelty in the achievement of their objectives should count against them.