OTOH if you don't, then you have something like the 2002 Muppet Christmas Special where they put Kermit in an "It's a Wonderful Life" scenario. We see how the w

OTOH if you don't, then you have something like the 2002 Muppet Christmas Special where they put Kermit in an "It's a Wonderful Life" scenario. We see how the world would be different if he had never been born. There's a scene set in New York where a random shot shows the WTC in the background, insinuating that Kermit was somehow responsible for 9/11. Obviously that was never the intention of the producers but it ends up being a huge distraction from the rest of the story of the special.