Hannah Lamont: The Texas Chain Saw Massacre

"The film which you are about to see is an account of the tragedy which befell a group of five youths, in particular Sally Hardesty and her invalid brother, Franklin. It is all the more tragic in that they were young. But, had they lived very, very long lives, they could not have expected nor would they have wished to see as much of the mad and macabre as they were to see that day. For them an idyllic summer afternoon drive became a nightmare. The events of that day were to lead to the discovery of one of the most bizarre crimes in the annals of American history, The Texas Chain Saw Massacre." - This is the opening narration from the infamous famous horror film "The Texas Chain Saw Massacre. Supposedly, this film is based on a true story that happened on the 18th August 1973, however, this film was actually filmed before this date which shows it to be fake and already it is telling lies. It was only made to be on that date to make the film seem modern and scary to the target audience at the time.
www.imdb.com
Would this film still have been successful if they didn't try to suggest it was a completely true story?

Ed Gein

Born August 27th 1906 in La Crosse County, Wisconsin - not even from Texas.
Died July 26th 1984 in Madison Wisconsin.
Nicknames: The Plainfield Ghoul, The Mad Butcher
Found "Not Guilty by reason of insanity".
Inspired the characters Norman Bates (Psycho), Jame "Buffalo Bill" Gumb (The Silence of the Lambs), "Jed"Leatherface" Sawyer/Thomas "Leatherface" Hewitt (The Texas Chainsaw Massacre franchise) and Dr. Oliver "Bloodyface" Thredson (American Horror Story: Asylum)
Date apprehended: !6th November 1957
Scolded by parents - especially his mother - when he tried to make friends with other children at his school. - http://www.trutv.com/library/crime/serial_killers/notorious/gein/begin_2.html