"King of the Bingo Game" takes the position that you can find truth in madness. It's as though the protagonist went through an intense experience and discovered the meaning of life, only this was a hunger, depression, and liquor-induced mental experience, and he discovered what it was like to feel in control of his own destiny for the first time. Unfortunately, to the outside eye, this looks a lot like insanity. This story suggests there's something about the extreme nature of insanity that allows its possessor insights otherwise hidden from view.
The protagonist is not insane.
The protagonist is insane.