Prometheus 2012 was chock full of stupids.
Wasn't it just! Well, I presume the second half had its share too because I gave up watching when they all opened their helmets. "Oh breathable air! Helmets off everyone" (The words, 'airborne pathogen' having presumably been left out of their preflight briefing.)
I think there are two types of stupid movie mistake. Those that are in character and those that aren't.
I'm quite forgiving of a characters' mistakes if the character makes them in situation where making a mistake is possible - we all make mistakes under pressure - and I'm
very forgiving if the character quickly realises she has made a mistake and tries to remedy the situation.
What is less forgivable, and what tends to sink movies for me, are those moments where the character does something so out of character it's unforgivably unbelievable. Like the highly trained scientist in
Prometheus not even considering for second that there might be more than just gases in the atmosphere.
I mean how difficult would it be to write a line like:
Character A holding up tricorder-type device.
"The air's pure. No viruses or bugs of any kind"
...to keep a great chunk of the audience from throwing their popcorn at the screen.