I've heard it said that, during intense confrontations, soldiers and police will often get a sort of tunnel vision, where they focus on one task to the exclusion of all others. This task is often not very strategically important (like disassembling the crew's camera equipment when someone is taking video on their phone across the street). Usually this mindset develops when the opposition is seen as purely an enemy - an "other" - rather than a person or persons whose interests oppose yours. In combat, this is often instilled into the soldiers by command. For these officers, I'm guessing it was the stress and longevity of the conflict.
Not to say that what they were doing wasn't moronic. Just that they may not have been in their right minds.