Dude, guro isn't even something I fap to. It's just relaxign to look at. Yes, it's relaxing. Seeing someone being torn apart makes me calmer. It's obviously some--to use hoity toity psychological terms--a sublimation of some psychic pressure, or just a constellation blowing off steam.
Point is, if you've ever slowed down to look at a car wreck, then you. like. guro.