Of course it does. But when one holds too much power, such as those who destroyed Alderaan and the Hosnian system, that's obviously an imbalance in favor of the dark. You could take it to mean we have to be at war forever to maintain balance, but that's not true. There will always be opposing view points, but it doesn't always have to lead to death to keep things in check.
Honestly, not seeing that we need both light and dark is one of the things I don't truly understand about the the Jedi Order that fell here. How could they think anything was balanced without the Sith to properly counter them?