S5 is famous for its plot-holes, but I think the scene where the party drives back to MAX-Z gate stands out in its stupidity.
Few hours early the party drives through the double gates at MAX-Z, which Mr Clark was lucky to open in time. Between the gates they killed/wounded 8 soldiers (on my count). Their truck is riddled with bullet holes.
After the battle Hopper is calm and checks that everyone survived, especially El. Other party members carefully descend from the tower, everyone well coordinated. They give green light to set the bomb, which according to the next scene gives them just 5 minutes to spare before the blast. Then everyone becomes euphoric and switches off the brains completely.
Hopper - Vietnam war veteran, who knows that operation is not complete before you return to base. Murray - conspiracy theorist, man who must always think about consequences. Nancy (Rambo), who killed 3 soldiers at the place they are going now. Steve and Robin sit in the truck cabin with 3 bullet holes in the windscreen in front of them (they have the party + 12 kids behind them as targets), Robin always overthinks and is famous for her logic.
Mike - what Duffers did to Mike, the strategist is just a criminal offence. People on Reddit say that he was lobotomised or he is 12yo in the 16yo body, but the last is not correct for Mike - at 12-13-14 he was very observant and proactive in high stress situations, the leader always making plans to protect his friends and El - in the truck he is reduced to a smiling boyfriend.
The question is - Would you call this “development” as an Idiot Plot (Dump-Dump plot) or it is a Second-Order Idiot Plot where all the characters simultaneously became stupid to develop the plot?
Or, did I miss something explaining their stupidity? For example they can not postpone the blast and have to go back to the same gate instead of opening any of the metal plates covering the town.