There are just so many idiotic moments and characters doing moronic things... it just baffles me what the hell such idiots are doing on a space voyage.
They don't know what they'll find... so the "no guns" was rather silly, but... felt true to the Swan character. However, Charlize Theron's character had just pointed out to the two scientists that she was in charge of the mission and they were just tagging along, so why Swan has ANY leverage over the decision to bring weapons completely contradicts the point of the previous scene. To add tension between characters, Swan should have been overruled and guns brought with them inside... though should have proved to be of no to little use or counterproductive - adds drama.
David, the android, was too out there. Everybody raves about the performance, sure, it was great, but the writing and the character was just... way too weird with what he did. So his mission is to save his "father", yet, on multiple occasions he does things that could directly put everybody, including his "father" in jeopardy. Tapping the wall - who knows what that'd activate, potentially endangering the mission, and thus endangering his "father's" chance of what he wanted. Bringing the pod back into Prometheus, infecting one of the scientists, who then infects the other... again, seeing as he doesn't know what he unleashes... bringing that back onto the ship endangers his mission regarding his "father".
Why was it meant to be a secret that Weyland was on board the ship? It never felt like it was any big deal and rather stupid to keep secret or the fact that he was Charlize Theron's father... never felt like it mattered.
As mentioned in the earlier post. First sign of breathable air and the stupid scientist pops off the helmet. Anyone going to a foreign place knows about foreign contaminants: not just visible ones, but bacteria and virus and in this case chemical and biological warfare - not to mention that THEY themselves are contaminating a foreign place with their breath and germs and such. The security officer on Prometheus should be fired for allowing them to take off their helmets and shouldn't have allowed any of them back onto Prometheus, as they are moronic idiots endangering the safety of everybody on board with their stunt.
And... the weird geologist who mapped the silo and knew where they were supposed to go... got lost?
And the flamethrower worked just fine in the atmosphere that would kill the flame immediately.
So, the WHITE space jockey's created all life on Earth. Our DNA matches theirs... except... it's seen in the first scene that whatever he drinks dissolves and breaks up his DNA and life starts from the scraps. But... anyone building something from scraps without a plan knows that there's basically no chance in hell of getting the same DNA through billion years of evolution to what the original was, through the use of dissolved fragments. They made us, visited us with several thousand years apart, inviting us to their weapons manufacturing moon by showing the star pattern that would only work when we'd reach space faring capabilities... and they invited us purely to wipe us out. Where the **** is the logic in that?
And what did Swan eat on the space flight at the end... and she couldn't go in stasis as she couldn't trust the android to not just go back to Earth, as was his plan - he's done nothing but try to kill her and everybody else for no real reason... so there really isn't any reason for her to trust him. And the space jockey just tried to kill her and the species was planning to destroy their creation on Earth... and she's still flying to their home... what does she expect to find there other than a bullet through the brain.