That's what Prometheus is for, though. We just got that in the last film.
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I don't think the film, Prometheus, fully answered the question that it ended with...who were the Spacejockey/Engineers, why did they create us, why might they have wanted to later destroy us, and then what happened that they changed their minds (was it just the outbreak of the accelerant on LV-223 that stopped them destroying us)? As an aside, why did the last surviving Spacejockey/Engineer on LV-223 want to then continue the original mission from 2,000 years ago after Weyland asked for more life and that he compared himself to the Spacejockey/Engineer as both being "gods." I don't think we got the answer to most of these questions when Prometheus ended and so Shaw and David's journey to the Engineer's homeworld was where this was going to pick up, which I was really excited about. So I'm left a little unsatisfied by not getting the questions asked in Prometheus answered in the Covenant film.
As an aside, I may have misunderstood what Riddles was talking about when he mentioned "their origin"...I thought he was going to explain our origin as "humans" to the "Spacejockeys." I always assumed the derelict in the 1979 Alien/Nostromo film was carrying the eggs as cargo and therefore the huge pilot in the Alien/Nostromo derelict produced these eggs and was transporting them somewhere when it crashed. I was never confused about who created the xenos because I assumed they were only spawned from the eggs we saw in the 1979 Alien/Nostromo film and came from a species on the same planet that the derelict jockey in the Alien/Nostromo film. It was just a dangerous species that lived on the same planet as the Spacejockey/Engineer. I wasn't asking back then if that Spacejockey/Engineer created the xeno? It didn't occur to me to ask this question. I was more focused on everything in that film that had to do with the eggs and jockey being so incredibly foreign. For instance, the ship was piloted by a huge alien in some type of interface chair...no steering wheel, no petals, no buttons, relays, switches, etc. That was an amazingly foreign concept for me with the film and so I just assumed the eggs there on that derelict ship were from the same world as the pilot. The mystery for me then was who this pilot was, not the eggs or the xenos. They seemed to be designed for one thing. There was no mystery to me what would happen in you came in contact with an egg like Kane did in the Alien/Nostromo film. The outcome was bad and it was deadly. Same thing for the xeno. You cannot reason with it or bribe it with money not to kill you. It seemed to be designed for one thing. There was no mystery about that.
With the Prometheus film indicating that this same Spacejockey/Engineer race actually created mankind, etc., etc., I was very intrigued. But now with Covenant, this intrigue kind of ends abruptly with no more answers to the questions about our relationship to the Spacejockey/Engineers. Or at least that is how I am interpreting things from the footage from the Covenant film that's been made available.
The Prometheus film was breathtaking stunning in my opinion...the graphics, landing sequences, etc. could have been works of art (at least for my personal taste). I had trouble with some of the characters in the film and following some of the logic, but I didn't expect to see an alien/xeno in the Prometheus film because Riddles indicated that had been done already (I'll have to search through the interviews to see if I can reference the correct one; I've slept since then so can't recall it specifically). Everything intriguing for me at least in the Prometheus film was mankind's relationship to the Spacejockey/Engineer. I think the trilobite and deacon were there for those film fans who wanted to see something similar to the xeno/alien, but my interest was on the origin of the Spacejockey/Engineer and mankind's relationship with this race.
Again, grateful to Riddles as a director and grateful for another Alien film, but I'm hoping before all the films are done and finished, we get an answer as to why the Engineers wanted to wipe us out. For some reason, it's a profound question that I would love to have answered.