I do agree with you, and especially this sentence is spot-on.
Balance is recognizing the dark side within all things, and accepting it’s existence, in order to fulfill self satisfaction, because there is no way anything can be ultimately good in nature.
To let me play devil’s advocate for a second, both The Clone Wars and The Last Jedi have used Yin Yang symbolism to illustrate the light and the dark as two sides of the Force. Luke seems to go at length to show Rey the aspects of light and dark throughout life and our reality.
Maybe they are wanting to demonstrate the dark side as a part of the Force to not demonize those negative aspects in ourselves. Yes, we all have bad, dark side flaws, but maybe seeing those flaws as evil is not the answer. Instead we have to recognize the strengths and weaknesses of those emotions.
The dark side is still corrupting by nature. If you give into your fear and anger it can lead you down a cycle of hate and suffering. The dark side is dangerous, but it is a part of who we are. We can’t deny it, we can only recognize it in order to overcome it.
So the dark side isn’t some evil we can just stamp out from the galaxy, it is an aspect of us that can lead us down a corrupting path if we give into it. So, the dark side of the Force can be thought of as a chaotic neutral aspect of nature, and when it makes contact with our own inner dark side, it can be volatile. So the dark side might not be evil by design, but people can use it to do bad things.
So yeah, maybe they’re going this route so kids don’t see their dark side as “evil”, just a part of themselves they have accept and understand in order to become a mature person.