Stupidity: The commando mission to save Chewbacca starts gunning down a few Stormtroopers in the hangar. The heroes then go on leaving the troopers lying down on the floor in front of the ship, in plain view. They don't hide them nor ask the droids (who have enough strength and tools to pull them in) to, in fact they tell them to stay put. No wonder they are found out later (after a ridiculously long amount of time).
Suggested correction: Hiding the bodies would have been a waste of time, anyone who came to the hangar would immediately notice that the guards stationed there were missing and there was now a strange ship parked there.
The droids have all the time in the world, and people just passing by are "more immediately" bound to notice corpses in the middle of a hangar rather than possibly maybe question the fact that you don't see guards in that part of the hangar or investigate the ship - which could approach without anyone taking exception by appearance alone. At least remove the bodies directly in front of the damn ship!
Why would they be more likely to notice dead guards than no guards?
Anyone passing by might well thing the patrols were just out of sync, or a shift change. Sure they might investigate further, but they might not bother. Whereas a couple of dead bodies? Immediate red alert. Worth taking 30 seconds to hide them, surely.
Perhaps, but then it's made irrelevant 1 minute later as Finn and Poe run down a hallway blasting about a dozen stormtroopers.
For that matter, 1 SECOND later they kill stormtroopers in the far part of the hangar. They are killing people all over the ship during their mission and it's not like they hide every single one of them, but they leave two bodies *exactly* in front of their ship (and telling the droids to stay put). You can even see later that there is a stormtrooper with his weapon pointed exactly where those two corpses are, with the 'smart' commanding officer asking "whose ship is this?" at the sight of that. Maybe I am spoiled by a trope here, but it's the first time that I see someone in an action movie leaving corpses right in front of their only escape route/vehicle, that's so counterintuitive. (Did they even have an escape plan, actually? I don't like hypotheticals, but gee, if only she did the Jedi mind trick thing to those 2 guards who came over to inspect the ship instead of doing it later. But I digress).
Stupidity: The eco-terrorists leave the Orca completely unattended allowing Madison to take it without anyone realizing until she is long gone. In addition, they don't post any guards at the exit of the bunker and Madison simply walks away without anyone noticing her at all.
Suggested correction: They leave the Orca in their empty command room within a bunker filled with loyal men. There is no way anyone could have broken in and stolen it. Madison had the advantage of already being in the bunker and even then had to navigate through the air ducts in order to steal the Orca and escape. They wouldn't have armed men visible immediately outside because they didn't want anyone to notice that they were there.
Either one of these issues by themselves wouldn't be particularly stupid but the combination of them both would indeed allow someone to just walk in and take the Orca. You don't need to post a visible guard at the exit, but nobody is watching the exit at all.
Stupidity: They make a big deal about how they've got the bare minimum of Pym particles left as Hank has been snapped away, but it never occurs to them to use their supply to jump back to a very safe time when Hank was around with a vast supply of them. They could bring them to their time and then have no end of attempts to get the stones without being on such a knife-edge.
Suggested correction: The problem is that they need to steal particles, and if they fail doing that, everything fails. They never thought of doing it that way because of that. Only when they failed in the past did they have to risk that, with again the possibility of failing. They couldn't take the risk to have their only chance of reversing what Thanos did fail because they want to be leisurely about it, ironically. They could do it in one go, that was the best bet and lowest in risk.
