Humor is constantly evolving just as people are constantly evolving. What was funny to those who walked before us is stupid today. What we find funny today would’ve been considered cruel and mean, possibly even sadistic.
In the 1950’s humor was characterized by innocent mishaps. Popular TV shows monopolized upon common household mistakes, such as burning thanksgiving dinner. It’s hard to really say why that was considered funny, though in its own way it was kind of cute.