1.- TV is archaic
2.- You should see the TV programs at a specific time. You can see youtube videos when you want.
3.- TV Programs have many sections but you are maybe interested or waiting for only one or 2 of the sections of the tv show.
4.- You can comment and interact with other people on youtube and share the videos you like.
5.- Children are clever and adults.
6.- You have a lot of historically related videos on youtube.
7.- More people than friends of tv broadcast owners have access to publish on youtube.