I'm oversimplifying here, but .. I think television shows have encouraged people to lie. At least, shows have encouraged people to tell "little white lies."
In a lot of sit-coms, lying to family members is viewed as "cute," and skillful liars are admired or given a pass.
We need to be able to trust that members of our family are being honest.
Two of my kids loved to watch reruns of "I Love Lucy." The amount of lying was overwhelming, so, feeling like a kill-joy censor, I pointed out to them that Lucy (and the other characters) relied too much on lying.
I'm not saying I haven't lied. I'm saying that we should aim to tell the truth. We should not assume that lying is "fine."
You are right, there was alot of lying on "I Love Lucy" and as I recall, on "Leave It To Beaver". However, the moral of each episode was that the lie was always found out and the liar never got away with it. Lesson learned.