Maybe Uncle Joe wouldn't have tried to kill John Wayne if someone had bothered to write musicals about him. On second thought, that probably would've him even madder, especially if the show's writer had declared, "We have ignored a scarier figure than Hitler."
But such sentiment could've been taken as praise by Stalin. Praise, though, would mean you are up to something. Unless it was cover for not being up to something. Hmmm. You can see why Stalin played it safe and just killed everyone.