Editing Khornate Knights (section)

==On GK/Ordo Malleus Teamkilling==

"Only the Grey Knights survive in the service of the Ordo. All other troops die when given over to them. The reason for non-survival among military units attached to the Ordo Malleus is simple. Any troops that an Inquisitor Ordinary has commanded have been exposed to Daemons. They are privy to one of the most closely-guarded Imperial secrets: that daemons are real and Chaos is a terrible threat. Those that survive a battle or campaign are executed, with full honors, shortly afterwards. They are expendable, and entire Imperial regiments and corps have been dispatched by the Ordo Malleus." 

This is from Realms of Chaos (1988) and paraphrased in Codex: Grey Knights. Ordo Malleus and Grey Knight types are not nice. They euthanize or mind scrub nearly anyone who finds out about Chaos/Daemons. No reason was needed to kill the SoBs at all. The Ordo Malleus/Grey Knights kill practically everybody they run into no matter how you cut it. This of course still doesn't explain why they used the blood to make wards, instead of just killing them and leaving them at that.

In ''Incorruptible'', by David Annandale, the GK teamkill their own after falling to genestealer/tyranid corruption.  Only slightly better than their initial assumption of having to kill their first in-chapter heretics.  That's a plus.

So we still blame Matt Ward, just for bad conveyance instead of continuity errors.

Except that explanation still doesn't make any sense, considering SoB already know about Chaos/Daemons, fight them now and both maintains some knowledge of daemons so they can be exorcised.  Also, consider that a battle force of SoB sent to purge a heretical cult may encounter daemons and request the Grey Knights' presence.

This also doesn't make a whole lot of sense when considering that the Guard regularly fights off Chaos warbands and the like who frequently make use of daemons, and they most certainly do not purge the entirety of Cadia every so often, nor do they purge the various Cadian armies that are going around the Imperium whenever encountered, despite said Cadians almost certainly having at least some knowledge of Daemons. So this whole concept really doesn't work to start with.

In short, killing every Imperial that has encountered Chaos and daemons, would very quickly lead to being no more Imperials to kill.