I think it's pretty obvious what 'Hotel California' is all about. A lot of musicians who came of age in the late 60's/early 70's dabbled in Satanism/the occult while subscribing to the whole hippie philosophy. Manson and his whole clan did, and so did - for a time anyway - the Beatles, the Stones, particularly Mick Jagger who hung out with a filmmaker named Kenneth Anger, a Crowley and/or LaVey disciple (not to mention people like Jimmy Page and Ritchie Blackmore). It's kinda weird - on the surface the love, peace & happiness vibe seems to clash with the negativism/darkness associated with Satanism, on the other hand it makes sense that naive hippies would be attracted to it since Satanism represents something equally anti-establishment. Satanism was another way to express rebellion in the age of rebellion, San Francisco, and CA in general, being the center/point of origin of that whole movement (which would also explain why the Church of Satan got started there).

I think a lot of people have a hard time believing that an all-American band like The Eagles would have anything to do with Satanism. After all, it's so much easier for mom and dad to think only Black Sabbath and Marilyn Manson worship the devil because it confirms all the stereotypes. The reality is often very different. Like, who'd ever believe that someone like Kerry Livgren from Kansas, another all-American band, was heavily into black magic and Satanism before an incident literally put the fear of God in him and he subsequently became a Christian just prior to 'Seeds Of Change'...?

Interesting subject anyway...