So because you're pure you can't be tempted? The only person I know of who was tempted by evil and didn't even think about going down that path was Jesus the Christ. Just because the Dark Side isn't a direct part of the Force doesn't mean you cannot be tempted by it. The Dark Side is many things, greed, lust, power, anger, hate, rage, suffereing, etc. You can be tempted by greed and power. Is greed a "side" of the Force, no. Is love a "side" of the Force, no. We are tempted by evil all the time. Just because you're pure one day doesn't mean you'll be pure the next.