Board Thread:Warhammer 40k General Discussion/@comment-112.207.255.135-20161026083000/@comment-8881468-20161028124913

you might really want to rethink that argument a lot.

Take a look at it from Russ' side:

You get the order given by the Emperor's legitimate chosen proxy. You have no reason to question it in any way. Not even mentionign that it would not have been the first time the Wolves had been unleashed.

And that is not even taking into account that the Thousand Sons effectively were a Chaos tainted Legion at that point anyway and thus would have been annihilated without much doubt. But hey, be my guest and read A Thousand Sons.