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Also, nice is boring and most of us hate boring >>
LOL, I am 'nice' and have
never been accused of being boring! In fact, I've been a bit
too exciting and stimulating for some tastes. Being nice does not mean being milquetoast... I'm as wild a woman as any could handle but I still strive to be conscientious and caring. Howver, sometimes being "nice" is not being good at all. You can give your kids candy all day long because you are being 'nice' but really you are being stupid and indulgent. "Nice" is not really a good word for what we are really talking about, which is moral development....
Consider
Kohlberg's Theory of Moral Development.
You can strive to be a Nazi or you can look to the Ghandis and Mother Theresas of the world for your inspiration...
Some of us think that the
really, truly boring people are the assholes, not the 'good guys'. Assholes are predictable, where it can be kind of exciting to see a nice person lose their composure.

After all, nice people struggle with the darker side of themselves, too.... the difference is, they have the mettle to
overcome the baser drives.
A lot depends on how you define and understand power. Some see power as cruelty and brute strength while others see it as the ability to inspire the best in others.