Producers and creators put demons in entertainment because people have these kinds of reactions to it. It scares people and intrigues people. Most “devil worshippers” (satanists) aren’t into the magickal side of practice. Modern satanists resemble people who are more into “self-help” than devil worship.
>A number of religious studies scholars have described LaVey’s Satanism as a form of “self-religion” or “self-spirituality”, with religious studies scholar Amina Olander Lap arguing that it should be seen as being both part of the “prosperity wing” of the self-spirituality New Age movement and a form of the Human Potential Movement. The anthropologist Jean La Fontaine described it as having “both elitist and anarchist elements”, also citing one occult bookshop owner who referred to the Church’s approach as “anarchistic hedonism”.
As for those who are into summoning demons, that’s a whole other set of people, many who aren’t self identified as satanists. Some are in the occult, some are pagan. Demons vary by culture, but many spirits are labeled demonic, but are actually something else, chthonic or nature spirits.
It’s not my pathway, I don’t mind “demons” typically, but I also am not into summoning spirits in that way. But in short, I think you’re looking at this from the “hysteria devil worshippers” Christian perspective, not perhaps realizing, a lot of that is Christian propaganda. Rather than it even resembling what current practices are for people who work with demons or modern day Satanists.