Board Thread:Warhammer 40k General Discussion/@comment-94.3.72.36-20131224225315/@comment-71.218.152.127-20140511062025

The Emperor's goal was to have the primarchs be the leaders of their legions. The Emperor's entire goal behind the Astartes was to make brave warriors that were strong in war but could also act normal when not at war, Which is why the Emperor disposed of the Thunder Warriors, he knew that if Angron brought the slave army with him, the slave army would essentially be similar to the thunder warriors and would be unable to function properly unless at constant war. Which therefore could pose another threat with the slave army killing citizens of the imperium on colonized worlds since they couldn't control themselves. Angron himself was already insane but the Emperor knew that since Angron was an Astartes, he would have a measure of sanity that would allow him to make it through the Great Crusade. In short, the Emperor didn't want an army of mindless and insane barbarians to embarrass his legions.