You two post before your "jest" WAS A FUCKING STUPID THING TO DO. Hard to see when your jesting when you post like that a post beforehand
I got Dark Eldar... Huzzah? Also why are we talking about that fucker Erebus who decided to fuck everything up... Wasn't it within First Heretic that violence would have been inevitable? Because if Lorgar just turned around from the Warp and returned to Terra and goes up to Big E and says that he's found Gods then the Emperor would facepalm that after he had the Ultramarines burn a favoured world of Lorgar's for worshiping the Emperor as a God now says he's found more Gods we should worship...
It's the Emperor's fault he didn't warn his sons about Chaos and the Daemons in the first place. They were fighting in some of the most emotionally charged battlefields the galaxy had ever seen. Chances are the veil between the Warp and realspace were going to be very thin. They were going to find out; it was inevitable. His sons were either very psychically active or full blown psykers, for god's sake.
Big E wanted to be a good father and keep the sociopaths and rapists away from what he has created Like an over protective parent he wanted to keep the knowledge about the warp as far away from his sons as possible. Because he realized shit would hit the fan so hard that the entire galaxy would feel the effects for the next 10 millennia. So in the end he did what he thought was right and is now sitting on the golden toilet for it.