User blog comment:Jochannon/A Counter-Proposal/@comment-1745925-20110610120133/@comment-1932673-20110610203923

Because the Emperor himself or at least one of the Primarchs commanded it, so no one in the Imperium would be willing to use traitor geneseed as that would be defying the Emperor himself. And the Inquistion has never trusted the Astartes, in fact they have one entire sub-branch dedicated to discovering the weaknesses of the Astartes and killing them! So why would the Imperium use traitor geneseed when it barely trusts marines made with loyalist geneseed. Even ifmn traitor geneseed is pure, the Imperium is never the most rational organisation, they almost certainly condem all geneseed from the traitor primarchs, even if it existed from before the heresy as tainted simply because it shares the same genetic code.