Good question. I’ve thought about this before and I think it sucks when morals are put in a show. Every comedy show I thought was/is really funny rarely, if ever had a moral inserted. The more morals, the lamer the show. For example: Seinfeld: no morals, awesome. Everybody Loves Raymond: full of morals, stupid. Curb Your Enthusiasm: no morals. Full House:full of morals, horrible.
Obviously this is an oversimplification, but the funniest shows stick to comedy and don’t excessively develop emotional relationships. The Office has been going downhill with all the Pam/Jim stuff, but 30 Rock is keeping it superficial and still funny.
I wondered what made Law and Order so successful, and I realized it was because it remained plot driven and rarely ventured into the private lives and relationships of and between the characters. Some people like the emotional drama, and there are shows for that. I don’t feel it works in comedy. Like how many movies have you seen that start out funny, then get sappy? God I hate that.