Because only the wild and wooly internet could make "banned" cartoons of the 1930's and 1940's available in this day and age. And only the concept of "public domain" prevents the likes of Disney and Time-Warner from getting them yanked off the web for copyright violation.

Classics you heard about but never seen on TV in your lifetime, such as "Coal Black and de Sebben Dwarfs" are trivially findable. Just google for them.

Some people have accused Walt Disney of being a Nazi, but that didn't stop him from making WWII propoganda films like Education for Death.