I think the moral and message and consequences are stronger in Rick and Morty than your usual sitcom.

Your usual sitcom the heroes are infallible and get at most a slip on the wrist. Here the narrator is saying, this anti hero is so bad he could literally destroy the whole world. He can't undo his mistakes because some mistakes are beyond even his abilities to undo.

We're resetting the situation because that's what sitcoms have to do, but it's the opposite of a happy ending. That's the message I got at least. Similar to the vat of acid episode. That actions have consequences and not all mistakes can be corrected.

It's actually the normal sitcom heroes that get away with everything by virtue of plot armor or plot ingenuity, while Rick and Morty cynically reset it because the show must go on, while hinting strongly that this is the only reason it's allowed and consequences were as real as they could be.

It's out of proportion. They permanently destroy the world, and the only consequence is that Morty feels bad about it. Rick is annoyed, but at a level more consistent with Morty breaking a vase - a valuable, beautiful, but ultimately replaceable object. It's implied that Rick has done this sort of thing many times before.

That's a better lesson than the common Deus ex machina that puts everything right. Them being able to flee and things appearing normal is still half the way to that, of course. The full lesson would be if there were no parallel worlds and they were just stuck there for several episodes, only to die and the show to end. But how it played is still a long way from the usual "our horrible actions had no significant consequences!"