I have talked a lot over the years on Augoeides about the almost complete non-existence of "occult crime." Time and time again, occultism will be cited as the motivation behind some horrible crime. And time and time again, it always turns out that the real motivation is something ordinary - usually sex, money, or revenge. Occultism makes a wonderful boogeyman because statistically speaking, nobody understands what magick is about. Ask a random person on the street and they are going to answer with something they saw in a horror movie.
Magick shows up in horror movies for the same reason that it gets blamed for any crime that includes elements of weirdness - again, because nobody understands what it's about. Ignorance about magick creates an information gap that filmmakers or criminal investigators can fill with whatever nonsense they want. As a teacher of magick, one of the things I have to keep explaining to new students is that magick doesn't work like it does in the movies. It also doesn't work anything like most "occult crime" scenarios propose.
You never see this sort of thing with Tarot or astrology - at least not anymore. That's because just about everybody has a pretty good idea of what Tarot readers and astrologers do. To be clear, lots of people out there think those things are bullshit, but even those people know what they are. Astrologers track the movement of planets through the sky and use those movements to predict future events and explain personality traits. Tarot readers work with decks of cards and interpret the symbolism of those cards for pretty much the same reasons.
Even a person who thinks Tarot or astrology are bullshit would never consider them reasonable motivations for weird crimes. The closest to that are scammers who exploit belief in them to con clients out of money - which is an entirely ordinary motivation, not anything occult. Magick doesn't get that same consideration because the practice is often secretive and kept out of the public eye. Magical organizations keep things like initiation ritual secret because they are based on the mystery tradition idea that initiations are more effective when candidates have no idea what to expect, not because anything heinous or diabolical is actually going on.
I keep my magical work and writings free and public in service to an idea that I call "exotericism." That is, I'm looking to demystify magick in the public sphere. I promote my books in an effort to make a little money, but it's not very much and my main goal is to make the material easily available. That way people can see what magick is and what magicians do, rather than some sort of horror movie nonsense. It's not sensational. It consists of study, analysis, and dedicated ritual practice. For anybody who doesn't have a passion for mysticism and the paranormal, the whole thing is actually pretty boring.