Board Thread:Warhammer 40k General Discussion/@comment-24114582-20140607204849/@comment-24114582-20140609092100

It's not easy for any human to get used to the smell of aliens, it's often described as being discomforting. But the extreme xenophobic reaction Space Marines have to the smell of xenos is probably a mix of imperial culture and, i think mostly, the hypno therapy sesions all space marines have during training. I'm guessing they have a lot of PURGE THE XENOS and HUMANITIES MANIFEST DESTINY going on in them.

Swap the anti-xenos vibe in hypno-therapy for a Greater Good one and surround your aspirant Space Marines with aliens so they get used to the smell, right from birth, and i dont see why they should be xenophobic.

And if it is hard wired, they could re-write some of the genetic code me thinks. They have the technology.