Well, I think those people exist in all countries, including the US. They don't torture pigs or chichens before slaughtering them, which means they don't do it for fun. They do it to dogs for some specific reasons. Some people believe metal will spoil snake meat, so they use a bamboo knife to kill a snake. Others believe blood should remain within the body of a dog to make the meat tasty, so they give a blow on the nose of the dog. Different people do different things. If I don't like it, I will stay away. Anyway, they don't harm other people.
That is certainly not true. Those who see nothing wrong in the slow and ugly torture of an animal see nothing wrong in treating an enemy soldier the same way, if not worse. In fact, the "Rape of NanKing" demonstrates the level of atrocity that has been perpetrated upon innocent men, women and children. The Khamer Rouge, Pol Pot, and associated regimes have similar records of brutality.
The inhuman treatment of POWs by Asians is well documented as well, and will never be forgotten.