For having red lightsabers? For wearing black robes? They're allowed to feel passion and attachement? If anything, the Jedi are evil for denying themselves those things. And Darth Plageuis for instance, he wanted to preserve life. What's so evil about that?
[Edited on 06.07.2012 8:29 PM PDT]
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I think you misplayed Kotor 1 + 2, it explains it in a lot of depth. Go back and play it, and talk to Kreia throughout the game, she gives you stories and stuff if you have the time/patience and you actually like star wars it's worth a listen.