LiveAbout elaborates on the Mister Rogers war story, writing that since around the 1990s, people have spread the tale that Mister Rogers picked off "as many as 150" people in Vietnam as a sniper. He supposedly recorded those kills in the form of arm tattoos. Once he starred in a children's show, he obviously couldn't talk about how he capped a bunch of people overseas. And that, the rumors said, was why Mister Rogers always wore sweaters.
That story, along with many other outrageous claims, is so wildly incorrect that it doesn't even deserve to live in the Land of Make-Believe. (Mister Rogers would probably let it, though because he was so nice.) In reality, Mister Rogers attended a theological seminary but found his true calling bringing joy to millions of children. As for the sweaters, the Fred Rogers Company explains that Rogers' mother used to knit sweaters for him by hand as a way of saying, "I love you." And wearing those sweaters on the show reminded him of her.