system
Given the following post, respond as if you're commenting on Reddit:
human
[Dragonball Z] Why did Supreme Kai never stop Freeza?

Isn't he suppose to be some sort of guardian of the universe? So, wouldn't a genocidal intergalactic overlord be something he should get involved in?
gpt
Freeza serves a purpose. The Universe wants to stay balance between destruction and creation (Ying and yang). People like Freeza and Goku are left practically unchecked because they balance each other out with destruction and protection.

It is only when that balance begins to fail that the Gods get involved. The Kai's will only get involved if something too destructive is created (like Buu) and Bills will wake up if there is not enough destruction.