Movies that felt REALLY evil?

I love and respect horror, I’ve seen everything from vintage classics to gore fests and nothing really gets to me because I know it’s just a movie and an art form. However, Hereditary (2018), Evil Dead (2013) and Baskin (Turkish, 2015) actually FELT evil and made it incredibly hard for me to watch and I’ve never watched them again. Do any of you guys feel this way, too? What are some horror films you will never watch again because they felt a little TOO evil? I would also like to know more about these movies and maybe get some insight as to why they feel so intensely dark even though they are relatively tame compared to many others.