It's pure nostalgia again. It was on television almost every Christmas from 1969 to today. It was a Christmas tradition...
...and now unfortunately it's a tradition that is being copied by a thousand low-rent cartoons that even snatch the cover in their cheap imitations....
...but in any case, about two generations of American kids grew up with this as a part of their Christmas holiday, along with Rudolph and the puppet Santa cartoon. It's as much a part of Christmas as "It's a Wonderful Life" and "A Christmas Story," and it has spanned the generations.