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Yes it is, if you compare humans to other animals I am afraid that it is usually the human who is far more violent without good reason. While it is true that animals will kill for food, and will fight when feeling threatened,it is only humans who will kill, and torture for sport.
Fortunately most people are not capable of extreme cruelty, but our larger brains have given us a sense of entitlement, and superiority that can make us destructive to each other as well as other living things.It is the cruelety that we do not have to directly witness that is easy for us to justify.
I think it it may be opposite of what many people believe.If we truly want to avoid our crueler more destructive side we may need to be more in touch with our natural instincts not deny them. We need to accept that we are no better than the other animals that we share our space with.
There is no question about it. People are the most destructive, and at time deliberately cruel. We have no competition on that one.