I feel more neutral. The Force seems to be guided by emotion. Jedi train for emotional control. And yet they still get angry and show hate. Sith pull fully from negative emotions. Hate, anger and fear. I think the concept of the Gray Jedi could work.
There is no light. There is no Dark. There is only the Force.
We have seen Jedi, Mace Windu for example, use dark side fighting technics.