That’s because Ali was in Canada while American Soldiers fought for America.
You didn’t get to see Muhammad Ali fight because jihad hadn’t been declare, er. no. ACT (Action for Children’s Television) castrated tv fare and made it all “socially conscious”. Remember Yogi’s Ark where the Yogi Bear crew kept confronting polluters like some kind of anthropomorphic Greenpeace and the revamped Tom & Jerry cartoons where they were friends???
The president of ACT was sat down to watch some of these cartoons. She was not entertained but she was not offended by them either.
One of the creators of the Planet of the Apes cartoon said that they were challenged when they had the apes carrying guns, saying that children may mimic that behavior, so they made the guns much bigger and more complicated to make them appear like more unobtainable “cartoon” guns (but they were still bigger). This was an “acceptable” solution.