You know this how ? <| sep |> that ' s coo i wonder how much apple pays folks to host these shows <| sep |> Whats going on with his pants anyway <| sep |> You ' re so cool , can I just be you ? <| sep |> Primarchs are way smarter than Thunder Warriors , whom were all as unstable as the current World Eaters . If the Emperor tried to strike them down one by one , it would not be long before they caught on what he was doing , and even Russ would not try to defend him with excuses of purging mutations or such , when the two lost Primarchs were killed . And together , 16 or so Primarchs would have a good chance at killing him . Moreover , even if Primarchs were all dead , good luck when two million or so of the Legionaries find out that Emperor killed every single one of their dads . The ensuing civil war would eclipse the Horus Heresy in magnitude , and easily damage the Imperium beyond repair long before the war has actually ended . Lastly , Space Marines or Primarchs were not intended to have secret expiration date . They do not have killswitches like Thunder Warriors did . If they had , then the Horus Heresy would have ended much sooner .