To speak truthfully and insightfully today you must have a sense of the absurdity of human life and endeavour. Past attempts to construct grand and noble theories about human history and destiny have collapsed.
We now know we're just a bunch of naked apes trying to get on as best we can, usually messing things up, but somehow finding life can be sweet all the same. All delusions of a significance that we do not really have need to be stripped away, and nothing can do this better that the great deflater: comedy.
The Simpsons does this brilliantly, especially when it comes to religion. It's not that the Simpsons is atheist propaganda; its main target is not belief in God or the supernatural, but the arrogance of particular organised religions that they, amazingly, know the will of the creator.
The satirical cartoon world is essentially a philosophical one because it reflects reality by abstracting it, distilling it and presenting it back to us, illuminating it more brightly than realist fiction can.
This analogy actually makes great sense...
Couldn't have said it better myself !
Another reason why cartoons are the best form in which to do philosophy is that they are non-realistic in the same way that philosophy is.
Philosophy needs to be real in the sense that it has to make sense of the world as it is, not as we imagine or want it to be. But philosophy deals with issues on a general level. It is concerned with a whole series of grand abstract nouns: truth, justice, the good, identity, consciousness, mind, meaning and so on.
Cartoons abstract from real life in much the same way philosophers do. Homer is not realistic in the way a film or novel character is, but he is recognisable as a kind of American Everyman. His reality is the reality of an abstraction from real life that captures its essence, not as a real particular human who we see ourselves reflected in.