Board Thread:Warhammer 40k General Discussion/@comment-5846164-20130211074649/@comment-2253300-20130225224124

You're right. Astartes have a different psyche. It is even more intolerant than most humans. Secondly one isn't made into a Blank. They are born Blank. The fact that they can not feel fear is stated to be a direct biproduct of being soulless. Why would having no soul render one unable to feel fear alone?