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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Because they are for domination of the entire galaxy, and have no qualms with killing innocent people to get where they are.