McMahon could have gone down in history as the greatest promoter of all time, and you're probably right that eventually the details of his monstrous life will be scrubbed to highlight that part.
PT Barnum actually has TWO musicals ("Barnum" and "The Greatest Showman"), so two people thinking McMahon could get a highly-sanitized musical seems even more apt.
Barnum is at least a lot more honest about the history of the guy and doesn't shy away from the more questionable things he did (and actually ends on a pretty bittersweet note) vs Greatest Showman which feels way more disneyfied by comparison
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Good.