Kinda weird to think in-universe that the bad guys explicitly call their side the “dark-side.” Paradoxically they don’t believe they are evil but they’re also conceding that they are evil.
The dark half of the yin-yang isn’t evil.
Well… when the dark side of the Moon destroys an entire planet, Taoism tends to go beyond Star War’s pay-grade.
I’m just saying that that’s where it’s coming from.
When Vader says “Dark side” he isn’t saying “Evil side”.