Democrat Underground: The famous bunny cage, kerosene and concrete blocks experiment
People are A) so desperate to distrust and disprove somebody and B) so eager to place blame on an entity other than who is at fault, people will buy into crackpot theories such as this. A lot of people have devoted valuable time and energy debunking these silly myths.
Popular Mechanics had a good piece on the subject, for example.
But what good will it do, really? It serves to reassure the tiny minority of us who are beginning to wonder. That's all. It won't convince anyone else. They want to believe a lie. And as Friedrich Schiller said, against stupidity even the gods wrestle in vain.