Entertainment by itself is cathartic, but behavior change requires more than catharsis. A Mexican TV producer named Miguel Sabino started doing public health soap operas (telenovelas) during the 1970s.
http://www.apa.org/monitor/oct02/theory.aspx
His methods have since been used around the world, though very little in the U.S.
https://www.populationmedia.org/product/serial-dramas/
Indeed, but i guess entertainment can spark off people's cursiosity and somehow educate people. That's a very inspiring example on public health!
True, necessary but not sufficient.