Sounds like perfectly good gamer logic, that one should learn about evil in order to do good.
After all, why else would warriors want to wield those life-draining swords or wizards want to study all those tomes of dark magic in great detail? Only for the very best of intentions, surely?
Luke: So what you're saying is that the next step on the Path to the Light Side is the opposite of the next step on the Path to the Dark Side?
Yoda: Very good. Ponder this further, you must.
Luke: So... if I know the Path to the Dark Side, I can work out the Path to the Light Side?
Yoda: Follow this thought, you should.
Luke: So... what I need to do is ask Yoda to tell me the Path to the Dark Side!
Yoda: Stay in character, you should. But very clever.
Luke: So... what is it?
Yoda: What is what?