Life, The Universe, and Everything (Alien, Prometheus)

After seeing the movie I am filled with questions and ideas. What were the installations on LV223. Well the captain said, "These are weapon installations" or something to that nature along with "no one is going to build something like that on their front door.". Looking in the view of the valley it was apparent there were multiple domes, and so I'm extrapolating that beneath each dome there is another ship with a cargo-hold of other bio-weapon specimens. The Engineers WERE creating bio-weapons. That much seems to be pretty certain. The black-goo (some sort of DNA mutagen or whatever) was both seen to destroy life (at the start of the film the Engineer who ingests it as well as Holloway) and create life (with Shaw and Holloway and the fertilization). Side track to Shaw and Holloway: The surprise (OMG I'm preggers?) wasn't too shocking when the setup for it was only ~10 minutes prior (I can't create life… =[ ). However, this setup is telling us about a reproductive deficiency in Shaw. I'm going to go out on a limb here and suggest biologically this means that she has no eggs (or at least, none ever present in her uterine wall for sperm-fertilization). This means the black-goo genetic code (which has already reached the gonads of Holloway and altered his sperm) has enabled life to start from *just* sperm. Would the giant tentacle monster have come out of the garbage of Shaws quarters if they had used a condom? Or did it need a soft, warm place to gestate for some time (which was only a few hours in Shaw's womb) before becoming a self-sufficient tentacle monster? Anyway, the black-goo was seen to destroy and create organic material. It created a giant tentacle monster which eventually overpowered the last remaining engineer and implanted something in his body (corpse?). What pops out? Why, it's a slightly different variant of what we lovingly call the Xenomorphs. So, it looks like the Engineers-bioweapon facility that the crew discovers is just one of many ships with some variant on the Xenomorph (that we know and love) bioweapon. The face-hugger stage is more of a giant tentacle monster, and the end product Xenomorph looks a bit more frail and underdeveloped (but strangely is "lobbed" out of the Engineers corpse having bypassed the nymph stage we usually observe in the Alien movies). The engineers were creating bioweapons on LV223. HORRIBLE bioweapons. But humans are also a product of the engineers. Were humans also a designed bioweapon of the Engineers? Or perhaps just a science project of less vile intentions? If the latter, the question of "Why would the Engineers want to kill humans" still seems pretty mysterious. I've seen a few speculations, but we'd all like to know the reasoning of the Engineers. If humans *were* just another bioweapon created by the Engineers (seemingly less likely, due to us sharing the same DNA, but hey, maybe they thought pretty highly of themselves), it's probable they wanted to destroy us for fear of us becoming too powerful. Creationism or Darwinism? I'm terrible with names, but the guy who get's his arm broken by the worm-thing says early on "Are you ready to discount years of evolution?". It seems that these two don't have to be mutually exclusive to explain humans vs. the Engineers. Human evolution on Earth (after the point of deposit by the Engineers) could explain why humans aren't huge, hairless, and have completely black eyeballs. But then, wouldn't that make our DNA *not* a 100% match (even if it was still darn close)? I'm not sure because I don't have a biology degree. What about the deleted scene at the start of Alien. Ripley and the crew of the Nostromo receive an audible message from the "space hulk" on the surface of LV426. The message is intended to sound completely foreign and very alien. We're talking sounds very uncharacteristic of what the human vocal chords can make. The Nostromo crew wonder about the message (whether it is an invitation or a warning, hint: it's a warning). I realize I'm speculating on a non-canon deleted scene, but if the Engineers are a 100% DNA match to humans, wouldn't that message (despite being a different, alien language) sounded very human? This irrelevant detail can probably be chalked up to the story board writers for Alien not ever thinking the "space jockey" would be ret-conned or prequeled into a genetic precursor of humans. And that's fine, but it's just a detail I wish could have been woven together with the rest of Prometheus and Alien. Back to Shaw for a moment. With how volatile the black-goo mutagen is observed to be wouldn't Shaw experience similar symptoms as Holloway after becoming "pregnant"? Although David states "your pregnancy is not.. usual", I suspect there would be fluid exchange between Shaw and the tentacle-monster and that her genetic material would be infected like Holloways. Even if it stays completely isolated insider her womb, the painful-to-watch abortion scene shows bile spilling all over the place (including inside her exposed abdomen) when the membrane containing the tentacle monster pops. This is probably another less-than-significant detail, but nonetheless, one I couldn't help thinking. Anyway, so that's what I came up with. Any thoughts on this?