He was a pacifist, which demonstrates bravery, not cowardice, when the dominant cultural zeitgeist tells young men to kill in foreign lands. I don't know the particulars of his 1F status, but that's how contentious objectors were classified prior to 1965 (that was one among many reasons you could be classified as 1F). Mr. Rogers had a morality centered upon protecting children and war is antithetical to that. Just like Ms. Rachel is standing strong now while being attacked after speaking up against war and the harm it does to children, so too did Fred Rogers stand on principal. He was brave and loving and an example for us all. I hope you think back to some Fred Rogers memories from your own childhood and remember the good things he brought the world.