Stupidity: They say the airline industry was the perfect way to transmit the virus but how would the plane even fly if there was an infected person. In one scene the plane crashed within a minute of an infected person being on it.
Stupidity: They go to great pains to lock the nodes behind an explosive lock, then have a debate about whether Riddick's somehow broken in. They eventually unlock them, check they're still in place...then just leave the locker completely unattended and unlocked while they discuss plans, and Riddick of course steals the nodes.
Stupidity: There are numerous snipers on and around the White House. They should have barraged the lawn and wiped out all the attackers on foot with rifles and machine gun fire.
Stupidity: A trained CIA hitman wants to kill the owner of a bar. Why would he go into the bar during opening hours, ensuring that there are witnesses to be eliminated, when he could break in after hours, use a few less bullets, and have fewer loose ends to tie up? The break-in would also provide a cover story for the kill. All rather unprofessional.
Stupidity: Detective Loki checks in on Father Patrick Dunn and finds him passed out drunk. Dunn is a registered sex offender and drunk, but Loki goes in without backup or further plan. Yes, he had probable cause to enter the house once he saw Dunn passed out on the floor; however, he further explores the house and finds the hidden door behind the fridge. He then enters the basement without calling for backup, without notifying anybody else where he is at, and leaving himself at risk to be locked in. (00:30:35)
Stupidity: The security system is able to automatically ascertain the malfunction to the exact valve, and the electrical problem, but the alarm is not triggered at that point, but only when the holding cells are already filled with water and Breslin is making his return. They are on a ship, the fact that it's taking on water feels like a pretty important issue to monitor.