I never quite understood how in Star Wars it seems alot of the bad people seemed to become evil simply by choosing to study in the dark ways of the force. I never got how you can become 'evil' just by choosing to study a particular way of thinking.
I think it would make alot more sense in understanding how those people became evil if something tramatic happened to them during their lives which would have turned them evil. Or turned them against a certain group of people. But that doesn't seem to happen in the Star Wars universe. It seems the majority of the bad guys got that way simply because they chose to study in the dark ways and nothing else.
It seems a little odd to me that they can justify on why a person is evil simply because of that.