Sitcoms- Sitcom fans are very depressed people because their lives are so sad and boring.
They seek refuge in sitcoms where it appears that the characters are having a fun time, or at least a less boring time than the viewer. The viewer wants to ignore the fact that the characters are highly paid actors faking it, pretending that the sitcom is real life, in effect lying.
The viewer wants to be lied to a lot if that's what it takes to relieve their sadness. Scriptwriters are underpaid and in short supply, as evidenced by the lack of humor in sitcoms.
Fans don't seem to care because they hear the prerecorded laugh track that makes them think something must be funny, so they laugh. That's all they want to do anyway so it doesn't matter if nothing is funny as long as they laugh.
If sit-coms were actually funny there would be no need to add the laugh tracks. The irony is that sitcoms are not perceived as funny by happy people-who get depressed watching sitcoms.