People can be truly horrible. Those videos are shocking, crys.
I was once on a message board for animal lovers and a group of us got together after someone posted a video on YouTube of themselves deliberately hitting a cat and making it squeal with pain. this was a young teenage boy who seemed to think the whole thing was very funny.
We did a bit of detective work and managed to find out who this kid was, where he lived and who his parents (and grandparents) were. It turned out that his father was something of a legendary blues guitarist (American), his mother was quite a famous women's rights campaigner and his grandparents were really rather famous actors and social activists.
We managed to get this video brought to the attention of his parents who, understandably, acted on it.
This was the tip of the iceberg as far as animal abuse was concerned. And this was mostly lids posting videos of them torturing the family pet. If this is the way kids treat animals, then it's hardly surprising that they might grow up and treat vulnerable people in such a manner.