system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Is the dark side “natural” or not?

I’ve seen people on this subreddit say that the light side is the “default” state of the force, while the dark side is its cancer, or corruption. However, on TCW, there’s a being (the Son) who embodies the dark side. It’s established that he and the Daughter (e.g. the light side) balance each other. On top of that, there’s a cave in ESB in which the dark side is naturally occurring. How is this possible if the dark side isn’t natural?
gpt
There's no direct answer, unfortunately. Currently it seems that canon assumes that Dark Side is a perversion and corruption of "natural" state of the Force. There's not many sources on this, since there are no books focusing on Luke yet. 

In old canon Force is more complex thing, with light and dark definitely being a thing, but also other traditions interpreting it in their own ways, some believing in pure light, some in pure dark, and some considering it an entire spectrum. 

Although in both canons one of the sentiments goes that Dark Side primarily comes from the darkness within the person in question.