User blog comment:WhiteSeraph/Alternate Timeline Idea That I'm Really Psyched About/@comment-3341288-20110928015413/@comment-3341288-20110928022554

The kabal told them if the emperor won, that humanity would slowly decay (which it is) and fall to Chaos and the Galaxy would fall with it. If Horus won then humanity would be destroyed in 1-2 generations, BUT chaos goes with it. So...yah...really dont know what they were thinking.