The recent horrific and tragic murders in Charleston, South Carolina, along with violent gang rapes in India, come to mind, and the alleged shooter and rapists, while human animals, did not behave like nonhuman animals, so fast and superficial statements such as "They're just animals" are vacuous. I've written about this general topic before and absolutely nothing has changed about what we know about the behavior of the diverse lot of animals who have been studied. Indeed, a growing database continues to show that positive behavior patterns such as greeting, grooming, and social play, for example, predominate in daily interactions.
While nonhumans do on occasion fight, harm, and kill one another in same-species social interactions, these sorts of encounters are extremely rare when compared to more positive social interactions and they often occur in unique social situations and ecological conditions. To wit, consider what world renowned primatologist Jane Goodall wrote about violence in wild chimpanzees in her landmark book "The Chimpanzees of Gombe":