I don't think the Emperor's birth was quite as simple as a load of psykers deciding that life isn't for them. It was 100 (or 1000, can't remember) shamans that came together in a mass ritual, to create the Emperor. These shamans were all super-powerful, but the scale of powerfulness was logarithmic, not linear; Emprah is super-duper powerful after all.
The thing that gets me is the Emperor's mistakes. He makes a deal with Chaos, then stabs them in the face but somehow doesn't expect retaliation. Then when he leaves for Terra, he doesn't explain the situation properly, so everything is screwed over.
The worst case of explanation-fail is Magnus. I realise he might not have wanted to hear he was destined to sit on the Golden Throne and power the Imperial Webway, but the Emperor could at least have told him about the Webway (and hence why he was on Terra). He was a seriously bad parent.
The thing that gets me is the Emperor's mistakes. He makes a deal with Chaos, then stabs them in the face but somehow doesn't expect retaliation. Then when he leaves for Terra, he doesn't explain the situation properly, so everything is screwed over.
The worst case of explanation-fail is Magnus. I realise he might not have wanted to hear he was destined to sit on the Golden Throne and power the Imperial Webway, but the Emperor could at least have told him about the Webway (and hence why he was on Terra). He was a seriously bad parent.
