a) people whom one had once judged rational and intelligent turn out to be unashamedly stupid. b) day after day, with unceasing monotony, one is harassed in one's activities by stupid individuals who appear suddenly and unexpectedly in the most inconvenient places and at the most improbable moments. The Basic Laws of Human Stupidity
Close to 15% of the population fits that description. The US military has minimum enlistment standards at about the IQ 85 level. There have been two experiments with lowering this to 80 but in both cases these men could not master soldiering well enough to justify the costs. Almost 100 Million People In America Aren't Smart Enough To Enlist In The Military | Blog Posts