A lot of horror is experienced in a way that's most similar to comedy. That's not to say that it's explicitly supposed to be funny to the viewers (but sometimes

A lot of horror is experienced in a way that's most similar to comedy. That's not to say that it's explicitly supposed to be funny to the viewers (but sometimes it is! A significant portion of horror films include scenes of over-the-top violence that is absolutely intended, at least in part, to get a laugh through sheer shock and "OMG I can't believe they did that" value) but also that the tension-release cycle is pretty similar to comedy (and, sure, also porn, but it's much more similar to comedy for a bunch of reasons that should be pretty obvious, I think). Horror may also have a larger-than-most-genres share of fans who are watching at a much lesser level of suspension-of-disbelief, remaining very aware most or all of the time that "it's just a movie" and appreciating the craft, daring, and skill of the filmmakers, as much as the experience of the film per se. There's horror outside the comedy-esque thrill-zone, of course, and it tends to be really damn bleak and scarring, even without much gore (It Comes at Night, for instance). The gorey flicks are usually not among the "worst" the genre has to offer, IMO.