Board Thread:Warhammer 40k General Discussion/@comment-14745711-20130825021657/@comment-3258762-20130826173145

There can be no "good" gods, and there can not really be any true order gods.

The Warp is chaos. That's what it is, it is a place that is as opposite to the Materium as is possible, and since the Materium is an ordered place, according to the rules, the Warp cannot be ordered.

Furthermore, any positive emotion that is strong enough to bring about the birth of a God will result in it taking the positive emotion and pushing it to the point where it stops being positive.

Slaanesh was born of Pleasure, which is not a negative thing. But the Warps very nature ensured it was pushed to the point where everything is pleasurable, including pain. And if pain is to be pleasurable, it also must mean pleasure must be painful. Hence: Negative.