I agree with
@gourimoko that it's all about perception. In Hitler's fucked up mind he thought he was the good guy trying to "purify" the master race. From most other people's point of view though he was fucking insane, but that shouldn't ignore that everyone thinks they're the hero of their story.
I also agree with gour that the Force itself isn't good or bad, it's just the way you decide to use it. As far as I understand it, the midiclorians are nanobot-like things that help you wield the force and there aren't good nanobots and bad nanobots, there's just nanobots.
That's not to say that there are not good and bad people that use the Force to do good or bad things. And that's also not to say that a good person that uses the "dark" side of the Force wouldn't eventually "fall" into the way of thinking that comes with using the "dark" side of the force, meaning that they are more prone to destruction/agression.
Another good way of thinking about this would be to say that the Bible, based on the way an individual interprets parts of it, could be used for good or bad. If you're more prone to the angry God of the OT then you'll be less accepting of others and have a more rigid way of thinking. If you're more prone to the nice God of the NT then you'll be more accepting of others and believe that there are more important things that than traditions of the OT (that's an oversimplification of the Bible, but you get the point). You could also a mix of these though and be a very charitable person that helps others, but also hates gays because the OT says you should.
Anyways, that just my two cents on the debate.
@col63onel