system
Given the following post, respond as if you're commenting on Reddit:
human
[40K] Why are there no good gods?
gpt
The Big Four are many-faceted. For example, buried in the layers of rage and murder and hatred that form Khorne is a god of Justice. It's just that the negative aspects overwhelm the positive, what with the galaxy being so shitty. So "Justice" is normally manifested in tearing people's faces off and drinking out of their eyeballs. If a "good" martial god were to arise then Khorne would lay claim to it and attempt to control it - look what happened to Khaine. Khorne laid claim and he and Slaanesh fought over the Eldar War God.

(See also Nurgle's capture of the compassionate Eldar God Isha)