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When I think about late Sen. John McCain’s legacy within the realm of combat sports, the first thing that comes to mind, perhaps not surprisingly, is an episode of “The Simpsons.” In it, Marge lobbies to get violence taken off of TV because of its negative influence on children. After she writes a letter urging the network to “please try to tone down the psychotic violence in your otherwise fine programming,” the hyper-violent Itchy & Scratchy Show gets hilariously bowdlerized.