Well its common sensitivity on what everyone thinks of them, they're pretty much gross or brutal and vicious. And if you're a normal person, there is no pleasure whatsoever when watching these videos.
I think the worse one that I have watched is how they skin a dog alive in the middle of the street in Japan, seeing how he was skinless and still alive was just awful, the second worse is when they cut a guy in the half while he is still alive so he never stops screaming of pain.