Viviane: Higher order mammals exhibit bully behavior and killing for pleasure also. We ARE members of the animal kingdom. We were just lucky enough to evolve large brains and opposable thumbs.
I agree we are a family. We're made with similar physical systems and needs as the animals have and as a result we find ourselves to a degree able to understand them and if we so desire to empathize with them because we are a fleshly family with all living things on earth. Perhaps it's meant to help us maintain humility in the face of our exceptional abilities far above the animals.
As for any examples of bulling or killing for pleasure among the animals from what I've read for the most part that occurs when the animals are living in stressful conditions caused by their proximity to and/or mistreatment by people. Also, a degree of self-identification with the behavior can occur meaning we can "read" into the animal's behavior what we see in ourselves. We cannot read the animal's mind though.
We were just lucky enough to evolve large brains and opposable thumbs.
Surely you're not saying we are the only ones on earth with large brains and opposable thumbs. We're not.