We, as audience members have the luxury of foreseeing a character's death before the actual character does, so we can Monday Morning Quarterback things we see in movies for years.
We also get advanced notice of the jeopardy they are in before they know how royally fucked they are.
But, what we thankfully don't get to experience is the paralysing fear they go through in the moments leading up to the jeopardy moments, and fear/paranoia leads everyone to make decisions they otherwise wouldn't make.
So the credit that they're smart scientists is completely irrelevant.
Completely irrelevant? If that's the case, why even write in character traits?
Why bother making Barnes from Platoon a hardened and battle-scarred veteran? Why bother making Kyle Reese a hardened warrior from a nuclear wasteland? Why make Michael Corleone cool-headed and calculating?
When the shit hits the fan they all act like retards, so what's the point in giving them skills or experiences?
If Prometheus is going to have scientists, what's the point if, upon the very first opportunity to engage in science, they complely disregard common sense, protocol and the scientific method? They weren't terrified or scared at all when they took their masks off for no reason in an alien tunnel filled with an unidentified pathogen. If I recall, the idiot who took his mask off first wasn't even one of the "stupid" scientists.
Even setting aside the risk to himself, the moment he took off his mask he contaminated the entire fucking experimental site and ruined a large portion of the science they had been sent there to conduct. It was just Lindelof bullshit to artificially create five seconds of false tension as he removed the mask, with complete disregard to its place in the context of the greater story.
That's like Hicks, Hudson and Vasquez all shooting off their own feet while gearing up, before they even land at Hadley's Hope. Not fit to do their own profession. And in the case of Prometheus, few if any characters were written with more depth than their profession: biologist guy, archaeologist guy, pilot guy.
Shit like that would have been ironed out three drafts ago in a James Cameron script.