The Human Interface

The human interface of the F-22 jet fighter is so bad that it tries to kill the pilot, yet the airplane is smart enough to bring your corpse home.

the human interface is so bad that it actively tries to kill you the entire time you’re using it, and so good that it can deliver your comatose body back to safety with no help from you at all. 

The AR15, on the other hand, has a wonderful human interface:

 The AR-15, has such a “good” UX that even an untrained lunatic can use the technology with hellish effectiveness

It makes you wonder about the things the military makes.  When I was training in tanks, they routinely reminded us that tanks were designed to kill people, both our enemies and the crew.