I think childhood can cause new fetishes as a coping mechanism.
I was bullied and humiliated in school, because I was a half-blood (monoethnic country you see). That resulted in me enjoying humiliation.

My parents were toxic. There was violence, alcohol, huge expectations, fear and sadness. My father was beating my mother, she was beating me, and I was doing shit to animals.
I feel guilt for that (which also connects with my humiliation fetish), but those sadistic tendencies are still inside. That's why I enjoy domination and watching suffering women (it's coping mechanism, recreating the pattern, and/or revenge for abuses/rejections).

I'm not sure about guro though. Maybe it's because of what I did to animals, maybe it's because what I saw my parents did to animals. Maybe both.

But on other hand it was kinda there even when I was little. I remember when I watched Red Sonja for the first time as a kid and that scene in the temple made me feel so weird. I have lost any interest for the plot or action. I was mesmerized with those priestes throwed into the pit. It's still hot af scene for me.

So maybe it's like you have also some predispositions for certain kind of fetishes all along?
I have been wondering about genesis of my fetishes many times, but I will never know for sure, if I was borned or made like this. And I don't know which answer would be better.

I'm sorry for throwing at you all this personal shit, but I've decided I will treat posting on /dis/ as a form of therapy. Not like I need one, but you know how it is.