Think back to race relations, gender rights, same sex rights, wearing seatbelts, smoking, etc. In each case a COMBINED approach of education and entertainment showing the values we want our culture to have were present. How many shows skip the seat belts? Or how many movies set in the present day show lots of smoking by the good guys? Think back to moments like Kirk kissing Uhura or Ellen coming out: these things were also entertainment that led the culture. At the same time we had national conversations and strong educational movements.