While the video is cringy, it was part of a campaign at the time to bring awareness to the issue of Child abuse.
Back then sexual child abuse was thought to be a rare occurance. Henry Winkler brought it into the public discourse.
"About 1 million children a year are abducted or abused, says Winkler, who urges parents and children to listen to one another, recognize the extent of the problem and realize that it happens in the best of families under the best of circumstances."
https://www.washingtonpost.com/archive/lifestyle/1984/12/05/saying-noactor-henry-winkler-and-his-video-an-effort-to-prevent-abduction-and-attack/a4f9648c-6be4-414d-a4c2-8524d641c36a/?noredirect=on&utm_term=.197ed50d838c