The attitude of hostility to anything unknown is an artifact carried by humans since centuries. A stranger may be the thief, new idea may break the existing order, new food might be mortal and - last but not least - other members of society for sure will ostracize anything new.
Humans rely on experience and conservative strategy of development, however the history proved many, many times, that fearing of new is most often stupid, myopic and moron. Many inventions like fire, wheel, lightning rod, electricity, car or airplane used to frighten humans for years. A fear of strangers took a heavy toll of millions lives across the world and centuries. Eccentrics, freaks and sexually different humans were always kept at a distance as a result of distrust or anxiety.
Why?
If something is new to a given human, but well known to others, the reason is a lack of knowledge. If the novelty is unknown to all humans, the defective part is imagination. Doing new things is loaded with a fear of doing errors. Being frightened by strangers results in persecutions, unwanted social strains and - if things go wrong - in mortal Nazism.
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