Why would anyone choose to ride a rollercoaster , go skydiving , ride a motorcycle , ride a jetski , race cars , strap himself into a massive metal tube and propel himself to space on a series of explosions?
If it has to be explained you just won't get it. Adrenaline , you either get the rush or you don't.
Many people have a strong desire to "experience" fear and danger - but in a "safe way" (without any real danger to themselves), and scary movies are one way of doing that. It's not a lot different than going to an amusement park and riding the thrill rides - which replicate REAL-WORLD dangers in safe, fun ways.
I watch scary movies but don't watch to get scared because realistically theyre not scary at all anymore.. I watch it for the same reason I watch other movies. Story, acting, cinematography and if the horror movie is good, a good mind fuck.
I always beg my brother to watch them with me , I jump scare on everything ))) he got so pissed he walked out of the room saying - This why I not like watching film with you Petr! You make me jump about shit I not care about stop !! Me - 😼