What WOULD motivate a race to kill another race it had fathered?
Considering they ripped off the plot of AvP - the answer is simple, Xenomorph food
Why else would david (who gained knowledge from magic sparkly goo?) say "sometimes in order to create, you must first destroy" when he was asked?
To create a race of Xenomorphs, the must destroy a planet of humanoids.
We can see the substance is a mutagen based
Like a cheesy superhero origin story from the 50's - mutation doesn't work that way.
A Radioactive spiderbite won't turn you into aquaman, or even spiderman. So why does this "mutagen" turn a human baby into a squid? Then the squid metaorphises into a giant facehugger, and then back into a vaguely humanoid form? Its just so ridiculous and nonsensical/non sequitur.
Alternatively you could assume the room was originally her father's and she never bothered to change the machine since
It seems it was for her father, who was on the ship. Also they made it deliberatey ambiguous as to whether or not she was a robot - not that it affected the plot in any way.
The plot was simply incoherent. They couldn't even acheive coherence in basic things like why they had to wear helmets.
When they landed (btw, I'm still not giving a pass to the scene where they stumble across the structures by luck when landing, rather than doing a survey from orbit first, including spectrometry so they knew what was in the atmosphere without first descending into it) - they comment on the atmosphere
They say proportions of nitrogen and
oxygen that are just like Earth's - breathable
Then someone chimes in that it would be like sucking on a tailpipe - supposedly deadly levels of CO2 (did they mean just CO, 3% CO2 is perfectly fine, and CO isn't stable in an oxygen atmosphere anyway... so.. its just a stupid plot device).
Anyway, in this scene they established that it wasn't a lack of oxygen, but rather the presence of a poisonous gas,
Then they go inside the structure, and the douchebag says his suit detects oxygen, and that it must be breathable, and removes his helmet.
Hello? did the writers forget what they had already written? all they needed to do to maintain some coherence was to say he was reading reduced levels of "CO2"/ "CO2" was at safe levels.
But... noooo..... the writers were to eager to blow their load of religious references, ans spiel about having faith and not being so skeptical.
Even basic details like that they are unable to keep consistency.
The guy who is responsible for mapping the caves, gets lost despite being in contact with the ship with the map.
The guy who is afraid of a long dead human-alien and runs off later wants to pet an alien penis-cobra.
The human-alien that ignored shaw while he tried to pilot a ship to go to earth, later goes out of his way to find her, despite the presence of multiple other ships to take.
She was beneath his notice, and he was focused on his mission in one scene... they she does *nothing* and the blue-human-alien has a total change of priority... of course that was just setup so that he could die by the giant squid baby - but we assumed he had died in the 1st crash, so they could have just left that whole scene out and had a more coherent plot.
The plot:
Human-humans go to alien moon
Human-aliens at that moon try to send a ship to kill human-humans on earth
Human-Humans ram the ship.
The end
Everything else was irrelevant or incoherent.
That is not a good sci fi plot.
The script was terrible, and good scenery can't save it from being a turd.
Ridley didn't sell a good movie, so he's sold his reputation.
People are still going to see it because its attached to alien, and Ridley Scott (as evidenced by some posts in this thread).
My guess is they see it, and realize it was crap.
Ridley Scott's reputation is now worthless to me.
-Good think I didn't pay anything to see this movie.