I think Jordan Peterson simplifies the issue in the most concise and thorough way: Humans evolved in the context of a tribe, and so there is an inherent cost/risk analysis which goes into dealing with someone from another tribe. Such a person inherently offers something of potential value, such as someone to trade with, as well as an inherent probability of posing a risk to the tribe. The risk can come in many forms, most typically either to introduce a new disease or to become an enemy due to conflicting tribal loyalties.
To hear what i am referencing go to Youtube and watch the video entitled Rogan and Peterson on Hitler, public health, and the serpent
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