I don't see Rey turning to The Dark Side either, but I do see Ben turning back to The Light.
Turning to "The Dark Side"? Turning back to "The Light"? WTF?? Why can't people just say "good" and "evil" anymore? Why do they insist upon clinging to these color metaphors as if they are the only phrases that can be used to indicate someone's moral compass?

Darkness is not always an indicator of evil or anything negative. Light is not always an indicator of good or anything good. But apparently, a lot of people are unaware of this . . . especially these days.