Aside from that, how a comedy producer/writer/actor handles certain basic american issues does reflect his conservative/liberal/commie views.
In particular, the gun issue.
I saw very similar parallells with how guns were portrayed in The Simpsons, with how it was handled in "All in the FAmily". We all know that the producer, writers, and the actors and actresses on All In The Family were all liberal anti-gun.
Another example of liberal anti gunners was the TV show Bonanaza, where the liberal anti gunner liberal writers and producers and actors(including anti gun Canadian Lorne Greene) refused to let cast members wear gun belts with bullets showing. Look at those old shows, and you will see that none of the Cartrights, or anybody else on the show, had any bullets for their guns.
Therefore, I conclude, that the Simpsons are equally liberal.
Lots of comedies can be funny without attacking basic american institutions/values: Ozzie and Harriet, (Walt)Disney shows and comic books, I Love Lucy, The Andy Griffith Show, etc
What about the Halloween episode in which Lisa wishes away all of the weapons in the world, and then the aliens come to invade?
The same goes for the Halloween episode in which Homer takes down zombies with a repeating rifle.
Also: when Maggie goes thru the supermarket scanner (in the intro to every episode) the cash register reads "NRA4EVER."
In one episode, Bart wrote on the blackboard:
"Five days is not too long to wait for a gun."