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I really wish there actually was compelling evidence that having more women in positions of power would have a "civilizing influence" on societies. But I haven't seen any, and there's certainly plenty of at least anecdotal evidence to suggest that there's unfortunately not much difference.
My personal view on the reason for this is that the will to power, whether in women or men, is a force that requires compromising whatever values the subject may have to begin with. And the more power accumulated, the effect of all those "compromises" along the way results in a personality that will do anything, even violate previously strongly held moral values, to maintain and increase the level of power attained.
Case in point: potential future "leader of the free world", Iraq-hawk Hillary Clinton.