All animals attack each other. Even your pet tomcat will attack other cats, male and female (except when she is in heat) and will go on murderous rages towards kittens. Primates (our closest ancestors) are little better. They are in matriarchal bands, and will kill and even cannibalize members of other groups. What they do, however, is instinctual and has survival value. We supposedly have higher intellects. If true, we should rise above this mistrust of others, and abandon our nearly universal character defect of pigeon holing others, creating dangerous us vs. them paradigms.
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