Whatever happened to t.v. shows that used to teach a moral lesson?

If you watch television today, rarely do you come across a show that teaches a moral lesson to its viewers. Shows in the past like “Little House on the Prairie”, “The Waltons”, “Family”, and even situation comedies like “Full House”, “My Two Dads”, “A Family Affair”, and “The Partridge Family” always had a message about “life” and “how to treat others” in each of their episodes. Are there still shows like that around or am I seeing less and less of that nowadays? And if so, why?