Bravery is one requirement, I suppose. The other is the ability to not have the image permanently engrained in your mind, preventing you from sleeping peacefully, and once you think you're over it, the memory occasionally decides to come back to haunt you.
I'm generally very open minded, but guro and NTR (without all parties consenting) genuinely leaves me sick to my stomach for a significant length of time. I really don't get those fetishes, and if I was the Trump of fetishes, I sure as hell would build a wall around them. Maybe a roof as well.
That cute girl that died... she had a family. She had people that loved her, parents that spent many years raising her. Sorry, I've ruined my own mood now.
Correct me if I'm going too far, but I really have little tolerance for people who have empathy weak enough to stand that stuff.