Reddit Reveals The Top 10 Simpsons Fan Theories
10. Krusty is a terrible clown on purpose

Krusty the clown is deliberately terrible, because it’s part of his act of being a parody of a children’s entertainer.
“Krusty is secretly a comedy genius. No other style of show like his exists; he has cornered the market for “kidshow satire”, and he’s done it by foregoing the assumption that kids are too stupid to understand his real jokes.”
[h/t: Reddit]