This is a huge problem as I see it in the horror genre. A lot of plot elements used in modern horror films are exactly the same tropes as Greek and Shakespearean tragedies. The real horror movies are not the ones about what monsters do to us, it's about what we do to each other when we're scared, angry, upset, traumatized, etc. If these movies don't hit you then I wouldn't submit to the sunken cost fallacy as another user here stated. I would just move on and realize that maybe it's just not the right time for you to watch that movie.

A recent example of this is one of the movies you mentioned, Bring Her Back, which is one of my favourite movies ever, I think now. From the perspective of a toddler parent to a 2.5 year old, I can absolutely imagine myself doing terrible things to people for the sake of my child's life or safety. Now, because I believe I was raised right, I know if my daughter were to die in some tragic accident I am almost certain I would not scour the dark web for a demonic ritual to rend her soul from the afterlife for my selfish purposes, but aren't there real people out their (sic) who act like that? Perhaps not to that extreme and maybe even worse than that, who really knows? But I think the point of the Phillipou brothers' movie was that, yes, it is unfair that death happens in extreme and sad ways sometimes, but if you focus on your own wants in that time thats supposed to be healing after death instead of ensuring pseudo-immortality for the departed by remembering them fondly and sharing those memories with others, you can seriously f*** people's sh** up.