We're sorry to dredge up such upsetting news at the moment, but we feel it is our solemn duty to inform you that Kermit the Frog - beloved leader of The Muppets - is somehow responsible for the tragic events of 9/11.
Yes - the beloved frog puppet created by Jim Henson is responsible (either directly or indirectly) for the collapse of the World Trade Center's twin towers on September 11th, 2001. In a made-for-TV Christmas special (taking on the plot of It's a Wonderful Life), Kermit wonders what the world would be like had he not been born. Many of his fellow Muppets are adrift without him and living lives much worse than they would have had he been around, indicating Kermit's presence on this Earth was a positive one, and that he was a force of goodness in the world.
However, the quality of life of a few Muppets hardly compares to the lives lost in the WTC terrorist attack and the resulting events that followed - disease contracted during the clean-up, the United States' renewed War on Terror, the Patriot Act, etc. All of this could have been avoided, had Kermit the Frog simply never been born.
To be fair, it's never explicitly spelled out what exactly Kermit did or what about his presence would cause the horrific attacks of 9/11 to take place. And, to be fair, it's not clear whether the associated attacks on the Pentagon and on Flight 93 would have also been avoided.
All we know is that if Kermit the Frog had never been born, the World Trade Center would still be standing today.
Reminder - terrorism exists in the world of the Muppets, and Kermit is somehow responsible for it.