imho the point of 40K is that pretty much every faction is right bastards AND anyone can be true heroes.
like; what's ACTUAL heroism if you're an 8' tall superhuman in ceramite casually blasting away with what's normally a squad support weapon? What's heroism if you're merely a normal human in a battlefield full of 8' tall superhumans and somewhat plastered green Arsenal fans in search of cheap kebobs? What's truly heroic to a somewhat plastered green Arsenal fan in search of cheap kebobs?