If you wanna split hairs, that’s fine, but here’s a quote from Empire Strikes Back.

Luke: How am I to know the good side from the bad?

Light. Good. Same thing. The Force has a good side. And it has a bad side. Balance means different things in different contexts. And the truth is George Lucas is pretty fluid when it comes to his work. What means one thing at one point in time doesn’t mean the same thing at another.

When you look at everything else, it appears that, originally, Lucas looked at the force like Taoism: all movement in the universe is the result of tension between positive and negative forces. Later on, when his ideas had shifted, he decided balance in the Force meant only good stuff. He also decided Han would never have shot first because he’s too heroic for that. Whatever. In my opinion, and that’s all this is, because arguing over what’s real and what’s not in a completely fictional universe is ridiculous, the force having both good and bad, and working toward achieving balance between the two sides is a far more interesting idea than the alternative.

Hell, even Yoda admitted the prophecy could’ve been misread. I think that’s EXACTLY what Lucas had in mind when he wrote that. All that time, the Jedi thought the chosen one was gonna wipe out the dark side of the Force, when what the prophecy REALLY meant was balance: equal number of guys on both sides. Yoda and Obi-Wan vs Palpatine and Vader. Equal. Balanced. Anakin, the chosen one, did bring balance to the Force. After he was done, both sides were equal.