I like the mystery and working through the clues along with the protagonists. I like watching the heroes and heroines form their battle plans, knowing it won't go smoothly. I love the tension the authors build chapter by chapter, creating so much suspense I can't put the book down. I know people are going to die along the way when I read certain types of books. But I don't want to read the gory details. I find myself skipping over torture scenes and descriptions of gruesome murders.
Obviously, some people don't mind the blood and guts or we wouldn't have all those movies series that go on forever. I always tell my kids they'll stop liking movies that are so scary as soon as they have to live by themselves. But I look away from the violent fights or gruesome killings on the screen. I might like the story but I don't like to see that part or read that part.
How much violence is too much? I guess an author or filmmaker have to know their audience. I like books that use violence to create tension not to try and gross me out or make me ill. Where is the line between the two?
As an author, I use descriptions of fights and battles I'm comfortable with. If I tried to insert more violence and bloody descriptions, I don't think I could do a good job. Some authors paint such vivid pictures of death with their words I worry a little about how they can describe it so well. Just kidding. I don't think you have to be disturbed to write horror or about evil people.