If you actually keep tabs on modern neuroscience (which I don't, though my father had written a thesis about the brain due to his PhD stuff so I got somewhat interested in it as well and checked stuff out), you'll know that even though there are extraordinary amounts of people actually doing neuroscience and they still don't know -how- the brain works, they know it works but don't know how, not even 'roughly' as you put it.
Who says nomads have DNA and are biological? I do, Nomad players do. Why? It's in the lore that's been around for years and -we- choose what our lore is, not you, not anyone else.
Nomads are grown not mechanically manufactured (if you actually read even the old nomad lore you'd know that). Rheinlanders had nothing to do with it, they were just tools that the nomads had infected. Anything to do with the Marduks in the SP had nothing to with Rheinland technology or government.
Yes, nomads are grown (at least, the blue dildo-like things that you see everywhere), the essence and existence of a nomad (you can call it their soul I guess) is transferred into the body from the Mirrorshare. If you relate to Einstein's theory then yes everything is actually a form of energy. But as humans are totally carbon made, nomads aren't. They biological parts perhaps yes, but most of the nomad is raw energy (heat, light...something) which it can use to perform different stuff that it may want.
As for feelings. The Nomad mind is far more advanced than a Human's. Anything they can do with their brains, we can as well. We can choose to have emotions at our pleasure. Nomads don't fear death, if a nomad dies, it's ''soul'' is transferred back to the mirrorshare, and then back into another body that is grown on a nomad base.
I've been interested in nomads since the beginning of my ''disco career'' and have joined the Keepers earlier in my 4+ years of disco, and not only joined but bored the hell out of the Keepers' creators about constant questions as to what does what, and now with the creation of the K'hara and some of the newer (which I also played a role in) lore.
I don't make up things as I go. I know the lore, you don't. Don't babble stuff that people actually look at and might take it as a serious part of the lore.
As for the answer to your question. Aurora simply wishes to take another path instead of killing the humans....actually, I think the first post explains that, or haven't you read that as well?