The westerns from many years ago depicted cowboys who were good and bad. The good cowboys wore the white or light-colored hats. The bad guys had the dark hats. As soon as you saw them on the screen, you knew which ones were good and which ones were bad. The problem is now the good guys no longer wear the white hats and the bad guys don't necessarily wear the dark hats. These days most people don't wear hats. It's hard to know the good guys from the bad ones.
How does this affect writing?
If as a writer, I can influence a child, I want the child to know good from bad. I want him or her to know the good guys from the bad guys. I want them to read about a character not that they can just identify with, but someone they can aspire to be.
