A plethora of possibilities

I personally think the movie was excellent and I'm reading some really engaging intelligent thoughts. It's just not a straight up linear story line and it's nice to have a plethora of possibilities open ended like that. I'll be having a few beer discussions about the film I can say that for sure! Having read lots of discussions, some of which have been very informative and useful, others not so much! I thought I'd throw my thoughts and a few monkey wrenches into the mix…. The DNA of the engineers was a perfect match, yet they were physically superior to us, to the extent the last engineer was able to put up a (short) fight at the end with the xeno. It's possible that this was a eugenics driven race and they were trying to create the ultimate being of superior intelligence that can survive in any environment. The only problem they had, was they couldn't create life. Despite their advances, they only found a way to clone, change or distribute life, else why do they need a sacrifice? There are also numerous references to the "soul", and how the human creation David doesn't have one, and talk of Shaw not being able to create life. I think this needs to be looked at from a holistic and spiritual point of view as well. Point in hand is, even to the super advanced engineer race, life was still somewhat of a mystery, or somehow constrained to only stem from other life. They had been to earth numerous times and they gave the different civilisations on earth a map. The only logical reason they would do that, is to create an invite as is explicitly said in the movie. Perhaps this was done at a time when the left wing in the engineer race government was in power, but then the equivalent of Hitler came in and change it all! Perhaps they found we were incapable of working together and that we turned out to be a selfish kind and needed wiping out, which was reiterated to the engineer at the time he was met with conflict when the humans arrived. Perhaps they invented or found the xeno soon after and changed their mind. They thought: let's wait for humanity to hit critical mass, then convert them all to xenos and nurture the new race. It's not like humans don't' experiment with stuff like that. We often try to control populations of insects by introducing predators etc. It's a wide-spread belief that very few plants support life, especially for those with a matching DNA to ours, which is part oxygen, part nitrogen etc. The planet LV-426 almost had this, but the engineers had to work around the toxic outside atmosphere using some clever super-water solution. Maybe under the correct atmosphere, the liquid goo has different behaviour and on earth it would have turned into sunny flowers and green peas :)