People
The world is so full of simpletons and madmen, that one need not seek them in a madhouse.
— Johann Wolfgang von Goethe

Behind the line May contain spoilers.
Our reading
An editorial interpretation.
The speaker argues that foolishness and madness are so common you don't need an institution to find them. They turn up everywhere in ordinary life. It's a wry, sceptical view of human behaviour, using the madhouse as the joke: the real thing is out in the open.
Context reviewed