Fifteen Reasons Why Mister Rogers was the Best Neighbor Ever lays out a pretty convincing case. For example:
I never watched the show, since I was in school, but now wish I’d known him. Link
Most people have heard of Koko, the Stanford-educated gorilla who could speak about 1000 words in American Sign Language, and understand about 2000 in English. What most people don’t know, however, is that Koko was an avid Mister Rogers’ Neighborhood fan. As Esquire reported, when Fred Rogers took a trip out to meet Koko for his show, not only did she immediately wrap her arms around him and embrace him, she did what she’d always seen him do onscreen: she proceeded to take his shoes off!
I never watched the show, since I was in school, but now wish I’d known him. Link