Though they definitely enjoyed it all, they decided to pour their sense of unease into the record.

You can't kill some myths although they've been disproved time and again. The lyrics rental car in miami and album cover photo of the Eagles signature rental car in miami tune "Hotel rental car in miami California" are some of these. The popular 1970's song tells the story of a weary traveler who checks into a luxurious, upscale hotel only to discover all may not be as it appears
Some persist the song must be written about an actual building (there WAS no 'Hotel California') so they assert it was a nickname for the Camarillo State Hospital, a state-run psychiatric hospital near Los Angeles which housed thousands of patients during its sixty year span before closing in 1997.
To them the lyrics seem to fit what a "mentally disturbed" person would experience incarcerated in a long-term care "madhouse".  The imagery of the song is explained as that person's hallucinations with moments of the startling clarity of knowing where he is.  And of course the "stab it with their steely knives" line made the place run by cannibals. rental car in miami Makes sense.  If you are insane yourself…
On the inner album (gatefold) cover there is a photograph where some see a shadowy figure on a balcony with his arms spread.  There are those that say it is Anton LaVay, leader of the church of satan, and he is welcoming all the innocents below to the trap.  "You can never leave".
Though they definitely enjoyed it all, they decided to pour their sense of unease into the record.  'Hotel California' is a metaphor for the 70's, the music industry and the "accidental" prison freely entered only to realize the trap.
But if you go on the internet there are still those out there that are convinced that this is a "devil" song.  There are also full websites concluding that Paul McCartney has been dead since 1966 and Elvis is still alive.
Or do you mean like the ones that claim that John Lennon, Janis Joplin, Jeff Lynne, Jimi Hendrix and Jim Morrison (among others) were in actuality space aliens who were sent to usher in an age of peace and love prior to a great influx of visitors from outer space. I mean, after all, their names ALL start with J . right J? Ummm, just forget I said anything, J! Nevermind!